NDM1-25-120

For more information, please visit the product page. date 10/2010 page 1 of 19 a division of CUI INC MODEL: NDM1-25-120 FEATURES •Compact package (0.5” x 1.075” x 0.579“) •25 A output •High efficiency, 92% •8.5 ~ 14 V input range •0.6 ~ 2.5 V output range •Auto-control™ technology •Through-hole •PMBus compliant NON-ISOLATED DIGITAL DC-DC POL CONVERTER DESCRIPTION: •Voltage/current/temperature monitoring •Programmable output voltages •Voltage margining •Differential voltage sense •Synchronize controllers for phase spreading operations •Programmable soft start and soft stop •Pre-bias startup •Input under voltage lockout •Output over voltage protection •Output over current protection •Fast over current protection •Over temperature protection RoHS CONTENTS Absolute Maximum.....................................................2 Power Fault Management Electrical Specification.............................................2 ~ 5 Input Undervoltage Lockout (UVLO)..............14 Pin Descriptions..........................................................4 Output Overvoltage Lockout (OVP)................14 Typical Characteristics (0.6V/12A)..............................6 Output Overcurrent Protection (OCP).............14 Typical Characteristics (1.0V/12A)..............................7 Output Lethal Current Protection (LCP).........15 Typical Characteristics (2.5V/12A)..............................8 Over Temperature Protection (OTP)................15 Mechanical Specification............................................9 Operating Information - Power Management Configuration Inputs Configuration Using Down Resistors.............16 Input Filtering...............................................10 Configuration Input Vset...............................16 Output Capacitance.......................................10 Configuration Inputs ADDR1 and ADDR2.......17 Auto Control™...............................................10 Supported PMBus Commands...................................18 Remote Sensing............................................11 Through-hole Soldering Information.........................18 Output On/Off Control..................................11 Powergood Signal.........................................11 Startup with Pre-Bias.....................................11 Sync Function...............................................12 Output Voltage Trimming..............................12 Startup Delay and Ramp Up Time..................12 Output Voltage Sequencing..........................13 Margining...................................................14 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com For more information, please visit the product page. date 10/2010 page 2 of 19 a division of CUI INC MODEL: NDM1-25-120 DESCRIPTION: NON-ISOLATED DIGITAL DC-DC POL CONVERTER ABSOLUTE MAXIMUM RATINGS characteristics VIN min Input voltage max units 8 nom 15 V 0.5 2.8 V 30 A VOUT Output voltage IOUT Output current Logic IO Voltage SYNC, PG, FAULT, CTRL, SLART, SDA, SCL -0.3 5.5 V Ground Voltage GND -0.3 +0.3 V Analog Pin Voltage ENABLE, VOUT, VSET, CRC, SENSE+, SENSE-, ADDR1, ADDR2 -0.3 5.5 V 125 °C Operating ambient TBD Storage Temp -55 INPUT / SUPPLY parameter conditions/description voltage idle current min nom max units 8.5 12 14 V 50 mA max units sysgood, no output, VIN = 12 V OUTPUT parameter conditions/description voltage adjustment range set using PMBus min 0.6 -20 voltage margin range1 voltage accuracy nom 0.6 V ≤ Vout < 1.2 1.2 V ≤ Vout < 2.5 5 2.5 V 20 % ±3 ±2 voltage ripple 8 current range % % 25 mVp-p 0 25 A line regulation VIN = 8.5 ~ 14 V -1 1 % load regulation VIN = 12 V -1 1 % SENSE+ input bias current SENSE+ = 4V 864 1,000 1,185 μA SENSE- input bias current SENSE- = 0.1V 20 25 30 μA ramp-up time adjustable via PMBUS 0.5 147.5 ms ON time delay range adjustable via PMBUS 0 1,000 ms 50 ms start-up time load transient voltage deviation CO = 500 μF load transient recovery time VIN = 12 V, CO = 500 μF , VO = 1 V ±80 recommended minimum output capacitor ceramic mV 100 500 1.Voltage absolute maximum of 2.8 V 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com μs μF For more information, please visit the product page. date 10/2010 page 3 of 19 a division of CUI INC MODEL: NDM1-25-120 DESCRIPTION: NON-ISOLATED DIGITAL DC-DC POL CONVERTER GENERAL / POWER / EFFICIENCY parameter conditions/description min output power nom 0 efficiency VIN VIN VIN VIN idle power sysgood, no output, VIN = 12 V = = = = 12 12 12 12 V, V, V, V, VO VO VO VO = = = = 1 V, 50% of maximum IO 1 V, maximum IO 2.5 V, 50% of maximum IO 2.5 V, maximum IO max units 62.5 W 86.9 83.3 92.0 89.9 % % 0.6 switching frequency 500 W kHz FAULT PROTECTION parameter conditions/description min power good range nom -10 over voltage threshold (OVP) max units 10 %nom 3.8 V over current threshold (OCP) adjustable via PMBUS 30 A fast current protection (LCP) threshold must be 2x OCP 60 A fast current protection (LCP) set point accuracy -20 20 % fast current protection (LCP) delay 0.2 0.25 μs 125 °C thermal protection threshold (OTP) adjustable via PMBUS -40 thermal protection hysteresis 20050 SW 112th Ave. Tualatin, Oregon 97062 105 15 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com °C For more information, please visit the product page. date 10/2010 page 4 of 19 a division of CUI INC MODEL: NDM1-25-120 DESCRIPTION: NON-ISOLATED DIGITAL DC-DC POL CONVERTER COMMUNICATION CONNECTIONS symbol pin IO type nominal operating voltage ENABLE 1 Analog I 0~5V description SENSE+ 2 Analog I 0 ~ 2.8 V Output voltage positive sense input SENSE- 3 Analog I 0 ~ 0.1 V Output voltage negative sense input Control signal to enable PWM controller n/c 4 -- -- ADDR2 5 Analog I Resistor Address setting for serial communication/configuration No connect ADDR1 6 Analog I Resistor Address setting for serial communication/configuration VSET 7 Analog I Resistor Output voltage setpoint configuration pin CRC 8 Analog I -0.1 ~ 0.1 V SYNC 9 Digital IO (pull-up) 3.3 V Frequency sync. port. Controller can be configured as master or slave. PG 10 Digital IO (pull-up) 3.3 V Power Good. Indicates output voltage rail is within regulation. Goes low under any fault condition or recognition of shutdown request. May be used to cascade (sequence) VR start-up in combination with SYSG pin (on following VRs). FAULT 11 Digital IO (pull-up) 3.3 V Fault output. Wired and Internal pull-up. Goes low under any fault condition (UVLO, OCP, OVP, OTP). When pulled low controller is disabled and restarts again when released. Used for fault management between multiple POLs. CTRL 12 Digital IO 3.3 V Control or Enable pin. No internal pull-up resistor. SALRT 13 Digital IO 3.3 V Alert line. Communicates fault or pending fault alert to master or host system power manager. Return path for external setting resistors (VSET, ADDR1, ADDR2) SDA 14 Digital IO 3.3 V SMBus compatible data serial input/output. SCL 15 Digital IO 3.3 V SMBus compatible clock serial input. n/c 16 -- -- No connect n/c 17 -- -- No connect n/c 18 -- -- No connect POWER CONNECTIONS symbol pin IO type nominal operating voltage VIN GND VOUT description 19~20 Power 8.5 ~ 14 V Input voltage 21~22 Ground -- Power ground 23~24 Power 0.6 ~ 2.5 V Output voltage LOGIC INPUT/OUTPUT CHARACTERISTICS parameter conditions/description input high voltage (VIH) CTRL, SCL, SDA, SYNC, PG, FAULT input low voltage (VIL) CTRL, SCL, SDA, SYNC, PG, FAULT output high voltage (VOH) SALRT, SCL, SDA, SYNC, PG, FAULT output low voltage (VOL) SALRT, SCL, SDA, SYNC, PG, FAULT 20050 SW 112th Ave. Tualatin, Oregon 97062 min phone 503.612.2300 nom max units 2 V 0.8 2.25 V V 0.4 fax 503.612.2382 www.novumdigital.com V For more information, please visit the product page. date 10/2010 page 5 of 19 a division of CUI INC MODEL: NDM1-25-120 DESCRIPTION: NON-ISOLATED DIGITAL DC-DC POL CONVERTER PMBUS parameter conditions/description min nom max units setup time, SMBus (tset) 300 ns hold time, SMBus (thold) 250 ns ANALOG SIGNALS parameter conditions/description analog IO SENSE+ analog IO analog IO min max units 0 nom 2.8 V SENSE- 0 0.1 V ENABLE turn on (10 mA max.) ENABLE turn off 2 5 0.3 V V POWER MANAGEMENT FEATURES parameter conditions/description min number of addressable devices nom 1 input UVLO turn-on threshold units 113 devices 8.5 V input UVLO turn-off threshold PMBUS input voltage monitoring accuracy PMBUS output voltage monitoring accuracy PMBUS output current monitoring accuracy max 0.6 V ≤ Vout < 2.5 V -170 170 mV -30 30 mV ±12% PMBUS temperature monitoring accuracy 20050 SW 112th Ave. Tualatin, Oregon 97062 8.1 ±5 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com °C For more information, please visit the product page. date 10/2010 page 6 of 19 a division of CUI INC MODEL: NDM1-25-120 DESCRIPTION: NON-ISOLATED DIGITAL DC-DC POL CONVERTER 0.6V / 25A TYPICAL CHARACTERISTICS Conditions (applies to all graphs unless stated otherwise): VI = 12 V, IO = 25 A load, Co = 500 μF Efficiency Output Load Transient Response 85 8.5 Vin 10 Vin 12 Vin 14 Vin 80 75 Efficiency (%) 120.0 mV DC mV AC 70 65 60 200.0 80.0 160.0 40.0 120.0 0.0 80.0 -40.0 40.0 -80.0 55 0.0 -120.0 -40.0 -160.0 50 0 5 10 15 20 25 Output Current (A) -80.0 -0.609 ms -0.409 -0.209 -0.009 0.191 0.391 Top Trace: Load Current Bottom Trace: Output Voltage (40 mV / div) Slew Rate: (1A/μs) Start-up 0.591 0.791 0.991 -200.0 1.391 1.191 Current step-change (6.25-18.75-6.25 A) Time Scale: (200 μs / div) Shut-down 0.8 V DC 0.8 V DC 0.6 0.6 0.4 0.4 V DC V DC 0.2 20.0 0.2 20.0 0.0 16.0 0.0 16.0 -0.2 12.0 -0.2 12.0 -0.4 8.0 -0.4 8.0 -0.6 4.0 -0.6 4.0 -0.8 -79.86 ms -59.86 -39.86 -19.86 0.142 20.14 40.14 60.14 80.14 0.0 120.1 100.1 Top Trace: Output Voltage (200 mV / div) Time Scale: (20 ms / div) Bottom Trace: Input Voltage (4 V / div) -0.8 -79.86 ms -59.86 -39.86 -19.86 0.142 20.14 40.14 60.14 80.14 0.0 120.1 100.1 Top Trace: Output Voltage (200 mV / div) Time Scale: (20 ms / div) Bottom Trace: Input Voltage (4 V / div) Output Current Derating Output Ripple and Noise 30A 80.0 mV AC 25 60.0 20 40.0 20.0 15 0 m/s 0.0 10 -20.0 5 -40.0 0 -60.0 -80.0 -7.986 µs 0 -5.986 -3.986 -1.986 0.014 2.014 4.014 6.014 8.014 10.01 Trace: Output Voltage (20 mV / div) Time Scale: (2 μs / div) 20050 SW 112th Ave. Tualatin, Oregon 97062 20 40 60 80 100 °C 12.01 Vi=12V, modules mounted on a 6” X 4”, 2 oz, 6-Layer test board phone 503.612.2300 fax 503.612.2382 www.novumdigital.com For more information, please visit the product page. date 10/2010 page 7 of 19 a division of CUI INC MODEL: NDM1-25-120 DESCRIPTION: NON-ISOLATED DIGITAL DC-DC POL CONVERTER 1.0V / 25A TYPICAL CHARACTERISTICS Conditions (applies to all graphs unless stated otherwise): VI = 12 V, IO = 25 A load, Co = 500 μF Efficiency Output Load Transient Response 90 8.5 Vin 10 Vin 12 Vin 14 Vin 85 80 Efficiency (%) 120.0 mV DC mV AC 75 200.0 80.0 160.0 40.0 120.0 0.0 70 65 60 80.0 -40.0 40.0 -80.0 55 0.0 -120.0 -40.0 -160.0 50 0 5 10 15 20 25 Output Current (A) -80.0 -0.609 ms -0.409 -0.209 -0.009 0.191 0.391 Top Trace: Load Current Bottom Trace: Output Voltage (40 mV / div) Slew Rate: (1A/μs) Start-up 0.591 0.791 0.991 -200.0 1.391 1.191 Current step-change (6.25-18.75-6.25 A) Time Scale: (200 μs / div) Shut-down 1.6 V DC 1.6 V DC 1.2 1.2 0.8 0.8 V DC V DC 0.4 20.0 0.4 20.0 0.0 16.0 0.0 16.0 -0.4 12.0 -0.4 12.0 -0.8 8.0 -0.8 8.0 -1.2 4.0 -1.2 4.0 -1.6 -79.86 ms -59.86 -39.86 -19.86 0.142 20.14 Top Trace: Output Voltage (400 mV / div) Bottom Trace: Input Voltage (4 V / div) 40.14 60.14 80.14 0.0 120.1 100.1 Time Scale: (20 ms / div) -1.6 -79.86 ms -59.86 -39.86 -19.86 0.142 20.14 40.14 60.14 80.14 0.0 120.1 100.1 Top Trace: Output Voltage (400 mV / div) Time Scale: (20 ms / div) Bottom Trace: Input Voltage (4 V / div) Output Current Derating Output Ripple and Noise 30A 80.0 mV AC 25 60.0 40.0 20 20.0 15 0.0 5 -40.0 -60.0 -80.0 -7.986 µs 0 m/s 10 -20.0 0 -5.986 -3.986 -1.986 0.014 2.014 4.014 6.014 8.014 10.01 Trace: Output Voltage (20 mV / div) Time Scale: (2 μs / div) 20050 SW 112th Ave. Tualatin, Oregon 97062 12.01 0 20 40 60 80 100 °C Vi=12V, modules mounted on a 6” X 4”, 2 oz, 6-Layer test board phone 503.612.2300 fax 503.612.2382 www.novumdigital.com For more information, please visit the product page. date 10/2010 page 8 of 19 a division of CUI INC MODEL: NDM1-25-120 DESCRIPTION: NON-ISOLATED DIGITAL DC-DC POL CONVERTER 2.5V / 25A TYPICAL CHARACTERISTICS Conditions (applies to all graphs unless stated otherwise): VI = 12 V, IO = 25 A load, Co = 500 μF Efficiency Output Load Transient Response 8.5 Vin 10 Vin 12 Vin 14 Vin 90 85 Efficiency (%) 120.0 mV DC mV AC 95 200.0 80.0 160.0 40.0 120.0 0.0 80 75 70 80.0 -40.0 40.0 -80.0 65 60 55 0.0 -120.0 -40.0 -160.0 50 0 5 10 15 20 25 Output Current (A) -80.0 -0.609 ms -0.409 -0.209 -0.009 0.191 0.391 Top Trace: Load Current Bottom Trace: Output Voltage (40 mV / div) Slew Rate: (1A/μs) Start-up 0.591 0.791 0.991 -200.0 1.391 1.191 Current step-change (6.25-18.75-6.25 A) Time Scale: (200 μs / div) Shut-down 4.0 V DC 4.0 V DC 3.0 3.0 2.0 2.0 V DC V DC 1.0 20.0 1.0 20.0 0.0 16.0 0.0 16.0 -1.0 12.0 -1.0 12.0 -2.0 8.0 -2.0 8.0 -3.0 4.0 -3.0 4.0 -4.0 -79.86 ms -59.86 -39.86 -19.86 0.142 20.14 Top Trace: Output Voltage (1 V / div) Bottom Trace: Input Voltage (4 V / div) 40.14 60.14 80.14 0.0 120.1 100.1 -4.0 -79.86 ms Time Scale: (20 ms / div) -59.86 -39.86 -19.86 0.142 20.14 40.14 Top Trace: Output Voltage (1 V / div) Bottom Trace: Input Voltage (4 V / div) 60.14 80.14 0.0 120.1 100.1 Time Scale: (20 ms / div) Output Current Derating Output Ripple and Noise 30A 80.0 mV AC 60.0 25 40.0 20 20.0 15 0.0 10 -20.0 0 m/s 5 -40.0 -60.0 0 -80.0 -7.986 µs -5.986 -3.986 -1.986 0.014 2.014 4.014 6.014 8.014 10.01 Trace: Output Voltage (20 mV / div) Time Scale: (2 μs / div) 20050 SW 112th Ave. Tualatin, Oregon 97062 12.01 0 20 40 60 80 100 °C Vi=12V, modules mounted on a 6” X 4”, 2 oz, 6-Layer test board phone 503.612.2300 fax 503.612.2382 www.novumdigital.com 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 PC FILE NAME: 20 21 22 G ND 23 Vo 24 2.86 0.113 COPYRIGHT 2010 BY CUI INC. RECOMMENDED FOOTPRINT: TOP VIEW 1.27 0.050 (17 PLCS) 1.27 0.050 (18 PLCS) 9.91 0.390 1.52 0.060 (6 PLCS) 2.86 0.113 ZRJ DRAWN BY: NDM1-25 NDM1-25 PART NO. TITLE: APPROVED BY: UNITS: 20050 SW 112th Ave. Tualatin, OR 97062 Phone: 503-612-2300 800-275-4899 Fax: 503-612-2383 Website: www.cui.com TOLERANCE: ±0.1mm UNLESS OTHERWISE SPECIFIED A 3:1 SCALE: MM [INCHES] REV: RoHS a division of CUI INC NDM1-25 Vin 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 19 10.16 0.400 2.54 0.100 (4 PLCS) DATE 2/2 2/ 201 0 DESCRIPTION: 4.13 0.163 4.0 0.157 14.7 0.579 10.0 0.394 DESCRIPTION NEW DRAWING MODEL: NDM1-25-120 1.7 0.067 12.7 0.500 27.31 1.075 REV. A For more information, please visit the product page. date 10/2010 page 9 of 19 NON-ISOLATED DIGITAL DC-DC POL CONVERTER MECHANICAL DRAWING (THROUGH-HOLE) fax 503.612.2382 www.novumdigital.com For more information, please visit the product page. date 10/2010 page 10 of 19 a division of CUI INC MODEL: NDM1-25-120 DESCRIPTION: NON-ISOLATED DIGITAL DC-DC POL CONVERTER OPERATING INFORMATION - POWER MANAGEMENT INPUT FILTERING The NDM1-25 module has built-in capacitances to supply the pulsed current due to PWM switching. However, to help minimize input voltage ripples, additional input capacitance is recommended as follows: 1x 330μF POSCAP or electrolytic and 3x 22μF ceramic capacitors, placed as close as possible to the input pins. (see Figure 1) If large, long-term load transients are present, additional bulk capacitances are recommended, such as a 1000μF low-ESR electrolytic or OSCON. OUTPUT CAPACITANCE NDM1-25 The user has the ability to set the optimization goal of the Auto-Control™ algorithm in the V-Infinity Intelligence Center GUI. This is available on the GUI Demo tab under “Optimization Factor”. Nine settings are available, with 1 corresponding to the least aggressive optimization, ideal for low ripple, and 9 corresponding to the most aggressive optimization, ideal for fast transient response. The module defaults to 5, and this is ideal for the majority of applications where a good balance of noise and transient response is desired. Quiet Mode When Quiet Mode is turned on the module is always tuned to achieve the best regulation. Auto-Control™ will tune to a low value to give a low loop bandwidth, minimizing the amplification of wide band noise resulting in the lowest output deviation. Figure 1: Recommended Circuit AUTO-CONTROL™ The NDM1-25 utilizes an Auto-Control™ algorithm to achieve stability and optimal transient response. There is no need for any external compensation, as the algorithm automatically takes into account the input voltage, output voltage, load current conditions, and output capacitance. Auto-control™ achieves this by constantly monitoring the regulated output voltage on a cycle-by-cycle basis and adjusting the parameters of the controller to optimize the regulation. As the control algorithm takes into account all variations in the power stage, including operating conditions, component variations and component aging, the control loop can 20050 SW 112th Ave. Tualatin, Oregon 97062 Auto-Control™ performance can be observed during operation in the Demo tab of the V-Infinity Intelligence Center GUI. As the regulation of a DC-DC converter varies with load current, transient load step, amount of bulk capacitance, inductor value etc.; so Auto-Control™ varies also to optimize the regulation. Auto-Control™ also offers Quiet Mode and high ESR Output Cap Optimization Mode options to achieve different design goals. 100µFx5 330µF The amount of output capacitance required depends on the output ripple and noise requirements and transient performance, even though the NDM1-25 POL module does not require output capacitance for low noise operations. As good starting point is 5x100μF ceramic. (see Figure 1) These capacitors should be placed as close to the load as possible. Additional high frequency capacitors can be placed next to the load to improve transient performance at the load. maintain high gain up to as high a bandwidth as stability will allow, resulting in highest loop performance without sacrificing stability. The default algorithm is configured for balanced ripple and noise and transient response. The algorithm can be customized for better ripple and noise or faster transient response. When Quiet Mode is turned off the module is always tuned to achieve the best transient response. This means that during load transients the module will tune to a high Auto-Control™ value to give the highest loop bandwidth and lowest sensitivity. When there is no transient disturbance and the output voltage consists mainly of wide bandwidth noise the module keeps Auto-Control™ at a suitable value so that transient bursts are well regulated. This may increase the observed ripple during steady state load. phone 503.612.2300 fax 503.612.2382 www.novumdigital.com For more information, please visit the product page. date 10/2010 page 11 of 19 a division of CUI INC MODEL: NDM1-25-120 NON-ISOLATED DIGITAL DC-DC POL CONVERTER DESCRIPTION: High ESR Output Cap Optimization Mode Auto-Control™ automatically tunes for a wide range of capacitor values and types including low ESR MLCC, with High ESR Output Cap Optimization Mode set to LOW. However, even further improvements are possible for capacitor types where the ESR zero is significant, by setting the High ESR Output Cap Optimization Mode to HIGH. Beware that selecting High ESR Output Cap Optimization Mode HIGH when only MLC capacitors are employed may result in low level oscillation. By default high ESR output cap optimization Mode is set to OFF. POWERGOOD SIGNAL The NDM1-25 module provides a PG signal to indicate the status of normal operations. It is an open collector signal that requires a pull up resistor to a 3.3V line. It goes high when the output voltage is within regulation, and automatically adjusts for different output voltages. It goes low whenever the output voltage is out of regulation is such cases as over-current , over temperature or input under voltage. STARTUP WITH PRE-BIAS Auto-Control™ Technology Advantages • Robust reliable control. Impervious to variations in components and the application context. • Optimized higher performance control. Significantly improves transient performance and reduces the number of decoupling capacitors required in the end application. • Enables the use of lower cost (poorer tolerance components) without risking stability. The NDM1-25 allows a power-up into a Pre-bias condition. A Pre-bias condition happens when a voltage is present on the output of the power converter before it is enabled. The converter starts its ramp following the predefined power-up sequence (delay and ramp). When the reference voltage reaches the Pre-bias voltage level, the PWM output is enabled. Enable ramp logic REMOTE SENSING Vout In general, the load distribution circuit should have minimal impedance due to the large load current, to help achieve good regulation and low distribution loss. If needed, remote sensing can be implemented to improve regulation and transient response. Connect the +Sense and –Sense pins to the +Vout and –Vout points where regulation is needed, through two separate differential pair traces. vout prebias level vout t 0 NDM1 system initialisation Receive startup command Startup_ delay Ramp Rate can be set Start Power Control Figure 2: Pre-bias is greater than Vout OUTPUT ON/OFF CONTROL Vout By default, the device is configured to be always on without on/off control. The output of NDM1-25 can be turn on and off through the CTRL pin. Either positive or negative logic can be configured. With positive logic, the module will be turned on with a logic high on the CTRL pin, and turned off with a logic low signal. Negative logic is just the opposite. The device can also be configured to be always on without on/off control, which is the default device setting. The CTRL pin can also be used to allow for sequencing (see OUTPUT VOLTAGE SEQUENCING). 20050 SW 112th Ave. Tualatin, Oregon 97062 _ vout regulated vout_ prebias 0 phone 503.612.2300 Startup Delay _ t Ramp slope can be set Figure 3: Pre-bias is less than Vout fax 503.612.2382 www.novumdigital.com For more information, please visit the product page. date 10/2010 page 12 of 19 a division of CUI INC MODEL: NDM1-25-120 DESCRIPTION: SYNC FUNCTION OUTPUT VOLTAGE TRIMMING The NDM1-25 module achieved voltage regulation thru digital pulse width modulation (DPWM). A synchronization method is provided where multiple slave devices are controlled by a single master device via open loop phase alignment of the PWM patterns. The DPWM synchronization allows the timing of the pulse width modulation to be aligned between the master and slave(s) at the same switching frequency rate. The DPWM synchronization will prevent the devices from drifting from each other with respect to the start of the pulse width modulation. By default the slave phase shift is 180° from the master. Figure 4 illustrates the connectivity of the SYNC signal for the case where two slave devices are used in a master/slave configuration. This case shows the example where several NDM1-25 modules are used to control various voltage rails at the same switching frequency. DPWM synchronization ensures that the starting points of each slaves PWM patterns are under the control of the designated master device and that the master and slave on-chip oscillators are frequency locked to within a certain error margin. Master PWM1 Slave PWM1 PWM2 PWM2 SYNC(Out) NON-ISOLATED DIGITAL DC-DC POL CONVERTER As a digital POL module, the NDM1-25 module can be programmed via PMBus command to different output voltages without any hardware circuit board modifications. The output voltage can also be trimmed at the factory or via the V-Infinity GUI and stored in non-volatile memory in the NDM1-25 module. STARTUP DELAY AND RAMP UP TIME POL startup delay and startup ramp up rate are adjustable through GUI or PMBus commands. The startup delay range is 0mS to 1048mS. The default set up is 0mS. Ramp up rate ranges from 2.6V/mS to 10.13mV/mS. Ramp up is monolithic and default set up is 1V/mS. Vout can be adjusted real time with expected ramp rate Vout Slope can be adjusted 0 t Startup Delay Max = 1.048 s, Min = 0 s Vout Ramp slope Max = 2.6 v/ms, Min = 10.13 mv/ms Figure 5: Adjustable range of startup delay and ramp up rate. SYNC (IN) Slave PWM1 PWM2 SYNC (IN) Figure 4: Block Diagram of Master-Slave Synchronization Connection The slave device will check for slow and fast arriving SYNC pulses and flag the error condition if enabled. An error condition will cause an exit from master-slave synchronization, resulting in the slave returning to free-running PWM generation which is not aligned to the master. The slave will again begin the synchronization process. After all three stages of the synchronization process are completed, the slave PWM will again be synchronized to the master. 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com For more information, please visit the product page. date 10/2010 page 13 of 19 a division of CUI INC MODEL: NDM1-25-120 NON-ISOLATED DIGITAL DC-DC POL CONVERTER DESCRIPTION: OUTPUT VOLTAGE SEQUENCING volatile memory of the module. The NDM1-25 can be configured to achieve advanced voltage sequencing between power rails. This capability eliminates the need for additional power management circuitry, in a system environment with multiple voltage domains. Ensuring consistent and predictable start-up of multiple voltage rails after power-on or power system reset (due to power outage or fault condition) prevents catastrophic and unpredictable current flows through digital processors and other loads served. For fault management, the FAULT pin of each module can be tied together so that if there is a fault (Over Voltage, Over Current, Input Under Voltage, or Temperature) on any module in the system all units will shut down immediately and remain off until the fault condition is removed. The turn-off delays are ignored in a fault condition and there is no ramp down control. Coordination of voltage rails and predictable shutdown under fault conditions reduces the risk of unpredictable system behavior where a problem occurs with one of the voltage rails in a system application. NDM1-25 Programmable power-on sequencing delays may also be used to ensure certain voltage rails are stabilized before energizing mission critical functions. A recommended configuration for multiple module systems is shown in figure 6 where the control signal is used to initiate sequencing during normal operations and the FAULT signal is used for fault management. Before the load systems are connected, it is necessary to program the ON Rise Time, On Time Delay, and OFF Time Delay for each module. This can be easily accomplished using the V-Infinity GUI which is the ideal tool to program and fine tune these parameters during development. In the Basic tab of the Configure section of the GUI the ON Rise Time, On Time Delay, and OFF Time Delay can all be independently set to meet system requirements. Either positive or negative logic of the CONTROL pin can be configured as required. Figure 7 illustrated the timing diagram for normal sequencing. Upon assertion of the CONTROL pin the ON Time Delay begins. The output voltage will begin to rise after the ON Time Delay is over. The output voltage will rise monotonically until reaching regulation. The amount of time to reach regulation from the end of the ON Time Delay is the On Rise Time. When the CONTROL pin becomes unasserted the OFF Time Delay begins and the output voltage will remain regulated until this delay is over. The voltage ramp during turn-off is not controlled by the module, but by the load current as it discharges the output capacitance. Once the system designer is satisfied with the timing sequence, the timing parameters can be permanently stored in the non20050 SW 112th Ave. Tualatin, Oregon 97062 NDM1-25 NDM1-25 Figure 6: Multiple Module Configuration 3.3V CTRL = 0V Module 1 Vout Module 2 Vout On Rise Time Module 3 Vout phone 503.612.2300 On Time Delay Off Time Delay Figure 7: Timing Diagram fax 503.612.2382 www.novumdigital.com For more information, please visit the product page. date 10/2010 page 14 of 19 a division of CUI INC MODEL: NDM1-25-120 DESCRIPTION: MARGINING During test and development, it is often required to vary the output voltage around its target set point in order to determine whether the load can operate over a specified supply voltage range (Figure 8) The NDM1-25 provides the ability to set the output voltage at a predefined higher or lower value around the target set point. The Margin limit can be set through the GUI or PMBus command. The output can be commanded to switch between the High value, Nominal or Low value as a percentage of the nominal value. The range can be set ±20% of the nominal target output voltage value. +20% NON-ISOLATED DIGITAL DC-DC POL CONVERTER OUTPUT OVERVOLTAGE PROTECTION (OVP) The NDM1-25 offers output overvoltage protection to protect load circuitry from being subjected to a voltage higher than its electrical specifications (limits). The output of the NDM1-25 module will be turned off and device will enter an OVP fault state when the output voltage exceeds the pre-programmed OVP threshold for a time greater than the pre-programmed hysteresis delay. The module enters a hiccup mode and attempts to restart every 250ms. A maximum number of 8 OVP restart attempts every 250ms are made. Thereafter an infinite number of re-start attempts are made every 1 minute. It will recover automatically when the output voltage is reduced to less than the OVP limit. A maximum number of 8 OVP restart attempts every 250ms are made. Thereafter an infinite number of restart attempts are made every 1 minute. -20% OUTPUT OVERCURRENT PROTECTION (OCP) Figure 8: Voltage Margining The device will enter an OCP fault state and the output of the NDM1-25 module will be turned off if the load current is 15-20% over the nominal load current. The module enters a hiccup mode and attempts to restart every 250ms. It will recover automatically when the load current is reduced to less than the OCP limit. The OCP threshold level can be programmed via GUI or PMBUS POWER FAULT MANAGEMENT NDM1-25 supports the following fault conditions: • Input undervoltage lockout (UVLO). • Output overvoltage protection (OVP). • Output over current protection (OCP). • Over temperature protection (OTP) INPUT UNDERVOLTAGE LOCKOUT (UVLO) A UVLO condition inhibits the output while the input voltage is below the programmed threshold. The output of the NDM1-25 will not turn on until the input voltage exceeds the Vin UVLO Turn-On Threshold and will turn off if the input voltage falls below the Vin UVLO Turn-Off Threshold. The supported UVLO threshold range can be programmed via PMBus from 8.5V to 14V. In the continuous presence of a UVLO fault the controller will make an infinite number of attempts to re-start power control with no relaxation time between attempts, allowing very fast system response once the UVLO fault condition clears. 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com For more information, please visit the product page. date 10/2010 page 15 of 19 a division of CUI INC MODEL: NDM1-25-120 DESCRIPTION: OUTPUT LETHAL CURRENT PROTECTION (LCP) The NDM1-25 offers fast (through analog sense circuits) output overcurrent protection in the event of overload conditions or short circuit between the output voltage nodes (SENSE+) and ground (SENSE-) over and above standard OCP. Device settings determined through configuration resistors may be overwritten subsequently through serial communication during normal operation. The following configuration inputs are available • ADDR1 and ADDR2 • VSET The device will enter an LCP fault state when the output current rises above a pre-programmed LCP threshold. The LCP threshold level can only be programmed through the PMBus. The LCP response time is on the order of 250 ns and must be 2x the OCP threshold. NDM1-XX Post-Reset Power Up Valid input voltage applied Oscillator and PLL stabilised Built-In Self Tests (BIST) passed Calibration parameters retrieved and applied Factory default configuration settings assumed In the case of an LCP fault the device will make an infinite number of attempts to re-start power control with a relaxation time of 250 ms between attempts. NVM Configuration Configuration previously stored in NVM retrieved and applied OVER TEMPERATURE PROTECTION (OTP) Configuration Resistors The NDM1-25 offers thermal protection through its on-chip temperature sensor. The device will respond to the OTP fault by forcing the PWM1 signal from the controller to enter tri-state, immediately disabling power control. In the continuous presence of an OTP fault, the device will make an infinite number of attempts to re-start power control with a relaxation time of 250 ms between attempts. It recovers automatically when the module temperature is cooled down by 20°C. CONFIGURATION INPUTS NON-ISOLATED DIGITAL DC-DC POL CONVERTER Configuration resistor settings determined and applied Normal Operation NDM1-XX ready for power delivery and communication Configuration Changes (SMBus) Temporary configuration changes (through serial communication) remain active until NDM1-XX power removed. Configuration changes may be made permanent through storage of settings in NVM (on demand, using serial communication). Figure 9: Device start-up and configuration The NDM1-25 is equipped with a number of configuration inputs. These inputs can be used to configure a NDM1-25 if serial communication is not available. External configuration resistors are connected to the configuration inputs. If no external configuration resistors are detected, the NDM1-25 remains at factory default configuration. Device settings determined by configuration inputs can be modified through serial communication during normal operation. NDM1-25 configuration settings are determined in the sequence shown in Figure 9. Configuration resistors are determined during the NDM1-25 start-up process only. Once a NDM1-25 has completed its start-up sequence, the configuration resistors are ignored (until the next start-up). 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com For more information, please visit the product page. date 10/2010 page 16 of 19 a division of CUI INC MODEL: NDM1-25-120 NON-ISOLATED DIGITAL DC-DC POL CONVERTER DESCRIPTION: CONFIGURATION USING DOWN RESISTORS All configuration resistors (with the exception of VSET) should be selected from the standard E12 (or higher) series, with 1% tolerance, and 100ppm temperature coefficient. Configuration resistors should be connected to the configuration inputs, and grounded to the CRC pin, as illustrated in Figure 10. For all functions except VSET, sixteen distinct values of configuration resistors are detected (including short [0Ω] to CRC, or floating input). For VSET any value of resistance ranging from 6.2kΩ..68kΩ (outside any standard resistance series) may be used to choose the desired output voltage set-point. Configuration input readings are filtered internally by the NDM1-25. In addition to this, noisy environments may require the connection of a small filter capacitance (100pF) in parallel with the configuration resistors. The current injected into the configuration resistors is small (10μA typ.), resulting in negligible power dissipation and ground currents. RVSET 18.75KΩ •1V and is valid for all values of RVSET except for cases where pin VSET is shorted to CRC (or RVSET90kΩ). For both of these two special cases of RVSET (shorted to CRC, or floating) the output voltage set-point will remain at the factory default level of 0.6V. This relationship is shown in Figure 11. 2.507 2.500 Vout setpoint in V Configuration inputs ADDR1 and ADDR2 are used to assign an initial SMBus address to a device. In smallscale systems with up to 16 NDM1-25 devices, only one of the address inputs is required (ADDR1). Voutsetpoint = 2.080 2.000 1.760 1.440 1.500 1.173 0.960 1.000 0.800 0.600 0.500 0.640 0.533 0.437 0.363 0.000 0 10000 20000 30000 40000 R_VSET in Ω Figure 11: R VSET versus Output Voltage NDM1-25 VSET ADDR1 CRC ADDR2 RVSET RADDR1 RADDR2 Figure 10: Configuration inputs CONFIGURATION INPUT VSET Configuration input VSET can be used to configure the output voltage set-point, as well as initial behavior of control pin CTRL. Resistor RVSET can be chosen in a continuous range from 0kΩ..100kΩ but NDM1-25 output voltage restrictions (documented elsewhere) limit the useful RVSET range to approximately 8.2kΩ..47KΩ. The resulting output voltage can be determined by the following equation: 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com 50000 For more information, please visit the product page. date 10/2010 page 17 of 19 a division of CUI INC MODEL: NDM1-25-120 NON-ISOLATED DIGITAL DC-DC POL CONVERTER DESCRIPTION: CONFIGURATION INPUTS ADDR1 AND ADDR2 Configuration inputs ADDR1 and ADDR2 are used to assign an initial SMBus address to a NDM1-25 slave device. Unique device addresses are required in systems where multiple SMBus devices are connected through serial interface lines SDA (SMBus data) and SCL (SMBus clock). Bus conflicts will occur if more than one device responds to the same SMBus address. If serial communication is not required, or the factory-default SMBus address of 16 decimal (or 0x10) is acceptable, both inputs ADDR1 and ADDR2 may be left floating. In smaller-scale systems with up to sixteen NDM1-25 slave devices it is sufficient to utilize ADDR1 only (while ADDR2 is shorted to CRC). In this case, SMBus addresses 16..31 (0x10..0x1F) can be assigned through RADDR1. In larger-scale systems both RADDR1 and RADDR2 can be used, in which case any SMBus address in the range 16..127 (0x10..0x7F) can be assigned to the device. Note that a number of SMBus addresses in the address range 0..15 are reserved for special purposes (e.g. SMBus Alert Response, SMBus Host). SMBus addresses in the range 0..15 should be avoided, and cannot be assigned through ADDR1 and ADDR2 configuration inputs. If RADDR2 is not used (and ADDR2 is connected to CRC), the effective SMBus address is ADDRSMBus = 16 + index(RADDR1) with index(RADDR1) = 0.15 If both RADDR1 and RADDR2 are used, the effective SMBus address is ADDRSMBus = 16 (1+index(RADDR2)) + index(RADDR1) with index (RADDR2) = 0.6 Table 1 offers a summary of assigned SMBus addresses as a function of RADDR1 and RADDR2. R ADDR2 in kΩ 0 8.2 10 12 15 18 22 27 33 39 47 56 68 82 100 index 0 index 1 index 2 index 3 index 4 index 5 index 6 index 7 index 8 index 9 index 10 index 11 index 12 index 13 index 14 index 15 0 16 32 48 64 80 96 112 16 16 16 16 16 16 16 16 16 6.8 17 33 49 65 81 97 113 17 17 17 17 17 17 17 17 17 8.2 18 34 50 66 82 98 114 18 18 18 18 18 18 18 18 18 10 19 35 51 67 83 99 115 19 19 19 19 19 19 19 19 19 12 20 36 52 68 84 100 116 20 20 20 20 20 20 20 20 20 15 21 37 53 69 85 101 117 21 21 21 21 21 21 21 21 21 18 22 38 54 70 86 102 118 22 22 22 22 22 22 22 22 22 22 23 39 55 71 87 103 119 23 23 23 23 23 23 23 23 23 27 24 40 56 72 88 104 120 24 24 24 24 24 24 24 24 24 33 25 41 57 73 89 105 121 25 25 25 25 25 25 25 25 25 39 26 42 58 74 90 106 122 26 26 26 26 26 26 26 26 26 47 27 43 59 75 91 107 123 27 27 27 27 27 27 27 27 27 56 28 44 60 76 92 108 124 28 28 28 28 28 28 28 28 28 68 29 45 61 77 93 109 125 29 29 29 29 29 29 29 29 29 82 30 46 62 78 94 110 126 30 30 30 30 30 30 30 30 30 100 31 47 63 79 95 111 127 16 16 16 16 16 16 16 16 16 index 0 index 1 index 2 index 3 index 4 index 5 R ADDR1 in kΩ 6.8 index 6 index 7 index 8 index 9 index 10 index 11 index 12 index 13 index 14 index 15 Table 1: Assigned (decimal) SMBus address as a function of RADDR1 and RADDR2 Note: Addresses are represented in hexadecimal in the GUI 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com For more information, please visit the product page. date 10/2010 page 18 of 19 a division of CUI INC MODEL: NDM1-25-120 DESCRIPTION: NON-ISOLATED DIGITAL DC-DC POL CONVERTER SUPPORTED PMBUS COMMANDS FUNCTIONALITY COMMAND CODE COMMAND NAME DESCRIPTION On, Off and Margin Testing 01h OPERATION Turn the unit on and off from the CONTROL pin On, Off and Margin Testing 02h ON_OFF_CONFIG Configures CONTROL pin & serial bus commands needed to turn the unit on and off Fault Management 03h CLEAR_FAULTS Clear any fault bits that have been set Set Output Voltage 20h VOUT_MODE Use linear output voltage setting Set Output Voltage 21h VOUT_COMMAND Can use external resistor divider V0>2.5V Vout Margin 25h VOUT_MARGIN_HIGH Can be done through VOUT_COMMAND Vout Margin 26h VOUT_MARGIN_LOW Can be done through VOUT_COMMAND Set Output Voltage 27h VOUT_TRANSITION_RATE Shall be the same as soft-start rate Input Under Voltage 35h VIN_ON Literal format: Fixed voltage divider for 12 V op Input Under Voltage 36h VIN_OFF Literal format: Fixed voltage divider for 12 V op Fault Management 40h VOUT_OV_FAULT_LIMIT Over voltage protection Fault Management 46h IOUT_OC_FAULT_LIMIT Set current limit Fault Management 4Fh OT_FAULT_LIMIT Over-temperature fault limit. Had default value Vout Sequencing 60h TON_DELAY Time from enable to output ramp starting Vout Sequencing 61h TON_RISE The time from when the output starts to rise until the voltage entered the regulation band Vout Sequencing 64h TOFF_DELAY The time from a stop condition is received until stops transferring energy to the output Status 78h STATUS_BYTE Returns one byte of information with a summary of the most critical faults Status 79h STATUS_WORD Returns two bytes of information with a summary of the unit’s fault condition Telemetry 88h READ_VIN Reurns the input voltage in volts Telemetry 8Bh READ_VOUT The actual, measured output voltage in the same format as set by the VOUT-MODE Telemetry 8Ch READ_IOUT The measured output current in amperes Telemetry 8Dh READ_TEMPERATURE1 temperature readings can be returned for each device Telemetry 94h READ_DUTY_CYCLE The duty of PMBus device’s main converter in % Table 2: Supported PMBus commands THROUGH-HOLE SOLDERING INFORMATION To ensure module performance and reliability, adherence to IPC-A-610D standards for solder joint acceptability is recommended. To prevent damage to the module during manual soldering, special attention should be taken to avoid direct contact between the hot soldering iron tip and the pins for longer than 3 seconds. The NDM1-25 module is designed for RoHS compliant plated through hole mounting by wave or manual soldering. The recommended pot temperature is a maximum 270ºC with a maximum dwell time of 10 seconds. A maximum preheat temperature of 150ºC with a preheat rate of 3ºC/s is suggested. 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com For more information, please visit the product page. date 10/2010 page 19 of 19 a division of CUI INC MODEL: NDM1-25-120 DESCRIPTION: NON-ISOLATED DIGITAL DC-DC POL CONVERTER REVISION HISTORY rev. description date A initial release 10/12/2010 Warning : All information, including illustrations, is believed to be accurate and reliable. Users, however, should independently evaluate the suitability of and test each product selected for their application. CUI Inc makes no warranties as to the accuracy or completeness of the information, and disclaims any liability regarding its use. Specifications are subject to change without notice. 20050 SW 112th Ave. Tualatin, Oregon 97062 phone 503.612.2300 fax 503.612.2382 www.novumdigital.com