SG6105A

SG6105A — Power Supply Supervisor+Regulator+PWM July 2009 SG6105A Power Supply Supervisor + Regulator + PWM Features PC Half-Bridge (or 494) Power Supply Supervisor + two 431 + PWM High Integration with Few External Components Over-Voltage Protection for 3.3V, 5V, and 12V Under-Voltage Protection for 3.3V, 5V, and 12V Under-Voltage Protection for -12V and/or -5V Over-Power and Short-Circuit Protection Power-Down Warning Circuitry Power-Good Circuitry Delay Time for PSON and PG Signal Remote ON/OFF Function On-Chip Oscillator and Error Amplifier Two Shunt Regulators for 3.3V and 5V-Standby Latching PWM for Cycle-by-Cycle Switching Push-Pull PWM Operation and Totem Pole Outputs Soft-Start and Maximum 93% Duty Cycle Description SG6105A controller is designed for switching-mode power supplies for desktop PCs. It provides all the functions necessary to monitor and control the output of the power supply. Remote ON/OFF control, power-good circuitry, and protection features against over-voltage and over-power are implemented. It directly senses all the output rails for OVP without the need for external dividers. An innovative AC-signal sampling circuitry provides a sufficient power-down warning signal for PG. A built-in timer generates accurate timing for the control circuit, including the PS-off delay. The cycle-by-cycle PWM switching prevents the power transformer from saturation and ensures the fastest response for the short-circuit protection, which greatly reduces stress for power transistors. Two internal precision TL431 shunt regulators provide stable reference voltage and a driver for 3.3V and 5V standby regulation. Utilizing minimum external components, the SG6105A includes the functions for push-pull and/or half-bridge topology, decreasing production cost and PCB space, and increasing the MTBF for power supply. Applications Switching mode power supply for computers: AT NLX SFX (micro-ATX) Ordering Information Part Number SG6105ADZ SG6105ADY Operating Temperature Range -40 to +105°C -40 to +105°C Eco Status RoHS Green Package 20-pin Dual In-Line Package (DIP) 20-pin Dual In-Line Package (DIP) Packing Method Tube Tube For Fairchild’s definition of Eco Status, please visit: http://www.fairchildsemi.com/company/green/rohs_green.html. © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com SG6105A — Power Supply Supervisor+Regulator+PWM Application Diagram Figure 1. Typical Application SG6105A © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 2 SG6105A — Power Supply Supervisor+Regulator+PWM Block Diagram V33 V5 V12 UVAC RI PG GND VCC 2 3 7 5 2 μA 19 VREF 10 15 20 0.7V DSD UV Detector OV Protector UV Protector Delay 300ms Delay 3ms OP1 D SET Q 9 OP2 CLR Q S SET Q 8 FB1 3.2V VCC 5V D SET R CLR Q Q NVP 64μA Buffer O.S.C CLR 14 13 VREF1 FB2 2.1V 6 4 OPP Delay 7ms Q 2.5V 8μ A 2.4V Buffer Delay 7ms Delay 15ms 11 12 VCC PSON 1.4V 1 On/Off Delay 50ms 16ms Delay 2ms VREF2 18 SS 17 IN 16 COMP Figure 2. Function Block Diagram © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 3 SG6105A — Power Supply Supervisor+Regulator+PWM Marking Information 20 T : D = DIP P : Z = Lead Free Null=Regular Ppackage XXXXXXXX: Wafer Lot Y: Year; WW: Week V: Assembly Location SG6105ATP XXXXXXXXYWWV 1 ※Marking for SG6105ADZ (Pb-free) F- Fairchild Logo Z- Plant Code X- 1 Digit Year Code Y- 1 Digit Week Code TT: 2 Digits Die Run Code T: Package Type (D=DIP) P: Y:Green Package M: Manufacture Flow Code ※Marking for SG6105ADY(Green compound) Figure 3. Top Mark Pin Configuration Figure 4. Pin Configuration (Top View) © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 4 SG6105A — Power Supply Supervisor+Regulator+PWM Pin Definitions Pin # 1 2 3 4 5 6 7 9/8 10 11 12 13 14 15 16 17 18 19 20 Name PSON V33 V5 OPP UVAC NVP V12 OP1/OP2 PG FB2 VREF2 VREF1 FB1 GND COMP IN SS RI VCC Description Remote on/off logic input for CPU or controller. Turn on/off the PWM output after the 7.5ms / 26ms delay. PSON=0, the main SMPS is operational. PSON =1, the main SMPS is off and the latch is reset. 3.3V over-voltage/under-voltage control sense input. 5V over-voltage/under-voltage control sense input. Over-power sense input. This pin is connected to driver transformer or the output of current transformer. When not in use, this pin should be grounded. AC fail detection. Detect main AC voltage under-voltage and/or failure. The protection input for negative output, such as –12V and/or –5V. Trip voltage=2.1V. 12V over-voltage/under-voltage control sense input. The totem-pole output drivers of push-pull PWM. The outputs are enabled (LOW) only when the NAND gate inputs are HIGH. The maximum duty cycle on an output (OP1 or OP2) is 46%. Power-good logic output, 0 or 1 (open-collector). PG=1, the power is good for operation. The PG delay is 300ms. Output for second converter regulation loop. Reference comparison input for second converter regulation loop, 2.5V. Reference comparison input for first converter regulation loop, 2.5V. Output for first converter regulation loop. Ground. Error amplifier output and the input of the PWM comparator. The negative input of error amplifier. The positive input of error amplifier is a 2.5V reference voltage. Soft-start, settable through an external capacitor. The current source output at this pin is 8µA and the voltage is clamped at 2.5V. Connected to external resistor for the reference setting. RI=75kΩ. Supply voltage. 4.5V ~ 5.5V connected to 5V-standby. © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 5 SG6105A — Power Supply Supervisor+Regulator+PWM Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The absolute maximum ratings are stress ratings only. Symbol VCC IOUT VPIN Parameter DC Supply Voltage at Pin 20 Output Current at PG, Fb1, Fb2 Pins V12, OP1, OP2, FB1, FB2, SS PSON, V33, V5, VREF1, VREF2, OPP, UVAC, RI, NVP, IN, COMP, PG Power Dissipation Storage Temperature Range Thermal Resistance, Junction-To-Air Operating Junction Temperature Operating Ambient Temperature Lead Temperature (Soldering, 10 Seconds) Human Body Model, JESD22-A114 (TA=25°C) (TA=90°C) Min. Max. 16 30 Unit V mA V V W °C °C/W °C °C °C KV -0.3 -0.3 16.0 7.0 1.5 0.5 PD TSTG θJA TJ TA TL ESD -55 +150 82.5 +150 -30 +125 +260 3 Notes: 1. All voltage values, except differential voltages, are given with respect to GND pin. 2. Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. Recommended Operating Conditions The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not recommend exceeding them or designing to Absolute Maximum Ratings. Symbol TA Parameter Operating Ambient Temperature Range Min. -40 Max. +105 Unit °C © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 6 SG6105A — Power Supply Supervisor+Regulator+PWM Electrical Characteristics VCC=5V, TA= 25°C, RI=75KΩ, unless noted operating specs. Symbol ICC VOVP Parameter Total Supply Current 3.3V Over-Voltage Protection 5.0V 12.0V 3.3V Conditions PG High Min. 3.9 5.8 13.9 2.0 3.0 6.0 2.5 4.0 9.4 Typ. 5 4.1 6.1 14.5 2.6 3.6 7.2 2.8 4.3 10.1 2.32 3.2 0.3 2.1 67 0.70 2.40 1.20 7 7.0 Max. 10 4.3 6.5 14.9 2.8 3.9 8.0 3.0 4.5 10.4 2.39 3.4 0.4 2.2 71 1.35 3.75 1.88 9 10.2 Units mA V VUVP Under-Voltage Protection 5.0V 12.0V 3.3V 5.0V 12.0V V VUVS Under-Voltage Sense for PG Low Over-Power Protection (3) (With TOPP Delay Time) Over-Power Protection (Without Delay Time) V VOPP VOPPH VX VNVP INVP TOVP TUVP TUVS TOPP TNVP VUVAC=1.5V 2.25 3.0 0.2 2.0 63 0.37 0.80 0.37 5 3.3 V V V V µA ms ms ms ms Ms Disable Under-Voltage / Over-Power Protection Threshold Negative Voltage Protection: Voltage Level Negative Voltage Protection: Source Current Timing for Over-Voltage Protection Timing for Under-Voltage Protection Timing for Under-Voltage Sense for PG Low Timing for Over-Power Protection Timing for Negative Voltage Protection Shunt Regulator Section Current VREF VDEV, I VDEV, T REGLI-FB IOUT-FB** Reference Voltage Deviation of VREF Over FB Current Line Regulation (4) (4) (4) (4) IFB=0.5mA, TA=25°C IFB=0.5mA to 10mA 2.475 2.500 10 2.525 20 30 V mV mV mV/V mA Deviation of VREF Over Temperature Output Sinking Current Capability 4 ≦ VFB ≦ 15V VFB=2V 10 1 Notes: 3. VOPPS=(2/3) x VOPP + (1/3) x VUVAC. 4. Not tested in production. Continued on following page… © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 7 SG6105A — Power Supply Supervisor+Regulator+PWM Electrical Characteristics (Continued) VCC=5V, TA= 25°C, RI=75KΩ, unless noted operating specs. Symbol TPG VUVAC TR TF VOL2 ION2 Parameter Timing for PG Delay UVAC Voltage Sense for PG Power-Good Output Rising (5) Time Power-Good Falling Time Power-Good Output Saturation Level Power-Good Leakage Current Collector (5) Conditions RI=75kΩ Min. 200 0.68 Typ. 300 0.70 1 300 Max. 400 0.72 3 500 0.5 1 Units ms V µs ns V µA Power-Good Section CL=100pF, Pull 2.2K to 5V CL=100pF, Pull 2.2K to 5V IPG=5mA VPG=5V Remote On/Off Section VIH VIL VHYSTERESIS IPSON TPSON(ON) TPSON(OFF) TPSOFF High-Level Input Voltage Low-Level Input Voltage PSON Input Hysteresis Voltage Remote Input Driving Current Timing PSON to On RI=75kΩ 38 8 1.5 50 16 2.0 Timing PSON to Off (PS-off) RI=75kΩ Timing PG Low to Power Off RI=75kΩ 0.3 0.5 62 24 6.3 2 0.8 V V V mA ms ms ms Error Amplifier Section V2.5 IIB AVOL BW PSRR Reference Voltage Input Bias Current (5) (5) TA=25°C 2.46 50 0.3 50 2.50 60 1.0 2.54 0.1 V µA dB MHz dB Open-Loop Voltage Gain Unity Gain Bandwidth (5) Power Supply Rejection (5) Ratio Oscillator Section fOSC PWM Frequency RI=75kΩ 62 65 68 KHz Soft-Start Section ISS Charge Current 7 8 9 µA Comparator Section DC Duty Cycle 85 93 % PWM Output Section VOL VOH RO Output Voltage Low Output Voltage High Output Impedance of VOH IO=20mA V12=12V 4 1.5 3.3 0.8 V V KΩ Note: 5. Not tested in production. © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 8 SG6105A — Power Supply Supervisor+Regulator+PWM Typical Performance Characteristics 5. 7 2 .6 0 0 5. 5 2 .5 5 0 ICC-OP(mA) 5. 3 VREF (V) -40 -25 -10 5 20 35 50 65 80 95 110 125 2 .5 0 0 5. 1 2 .4 5 0 4. 9 2 .4 0 0 -40 -2 5 -10 5 20 35 50 65 80 95 1 10 1 25 Temperature (°C) Temperature (°C) Figure 5. Operating Supply Current vs. Temperature Figure 6. Reference Voltage vs. Temperature 6.000 67.000 66.000 fOSC (KHz) 5.000 VOH (V) 65.000 4.000 64.000 3.000 -40 -25 -10 5 20 35 50 65 80 95 110 125 6 3.000 -40 -25 -10 5 20 35 50 65 80 95 110 125 Temperature (°C) Temperature (°C) Figure 7. PWM Output Voltage vs. Temperature Figure 8. Frequency vs. Temperature 89.500 89.450 89.400 2.600 DCMAX (%) 89.350 89.300 89.250 89.200 89.150 89.100 -40 -25 -10 5 20 35 50 65 80 95 110 125 2.550 V2.5 (V) 2.500 2.450 -40 -25 -10 5 20 35 50 65 80 95 110 125 Temperature (°C) Temperature (°C) Figure 9. MAX Duty Cycle vs. Temperature Figure 10. Reference Voltage vs. Temperature © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 9 SG6105A — Power Supply Supervisor+Regulator+PWM Typical Performance Characteristics (Continued) 4.180 2.610 2.600 2.590 4.160 VUVP (V) 2.580 2.570 2.560 2.550 2.540 -40 -25 -10 VOVP (V) 5 20 35 50 65 80 95 110 125 4.140 4.120 4.100 -40 -25 -10 5 20 35 50 65 80 95 110 125 Temperature (°C) Temperature (°C) Figure 11. 3.3V VUVP vs. Temperature Figure 12. 3.3V VOVP vs. Temperature 3.700 6.180 3.600 6.160 VOVP (V) 5 20 35 50 65 80 95 110 125 VUVP (V) 3.500 6.140 3.400 6.120 3.300 -40 -25 -10 Temperature (°C) 6.100 -40 -25 -10 5 20 35 50 65 80 95 110 125 Temperature (°C) Figure 13. 5V VUVP vs. Temperature Figure 14. 5V VOVP vs. Temperature 7.060 14.600 7.050 VUVP (V) 14.550 VOVP (V) -40 -25 -10 5 20 35 50 65 80 95 110 125 7.040 14.500 7.030 Temperature (°C) 14.450 -40 -25 -10 5 20 35 50 65 80 95 110 125 Temperature (°C) Figure 15. 12V VUVP vs. Temperature Figure 16. 12V VOVP vs. Temperature © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 10 SG6105A — Power Supply Supervisor+Regulator+PWM Functional Description Protection against over-voltage, short-circuit, and fault conditions is mandatory in PC power supplies. These protection circuits can be realized by using many discrete components and comparators, which occupy a lot of PCB space and add to assembling costs. This single chip controller IC provides complete protection circuits, shunt regulators, and PWM control function with fewer components. SG6105A is an ideal controller IC for PC switching mode power supplies. The features and benefits of this device are: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. Over-voltage and under-voltage protection for 3.3V, 5V, and 12V without external divider. Over-power protection. UV protection for -12V and/or -5V. Power-down warning for power-good signal. Power-good signal and power-fail lockup. Remote on/off control. Delay time for PSON and PS-off signal. Two shunt regulators for 3.3V and 5V-standby regulation. Complete pulse width modulation (PWM) control circuitry. On-chip oscillator. Programmable soft-start. Maximum 93% duty cycle. Few external components. More reliable system. Little space on PCB. Easy trouble-shooting and implementation. 6. 4. 5. 3. Feature Descriptions 1. Over-voltage protection can be implemented without any additional components. Overvoltage sense levels for 3.3V, 5V, 12V, are 4.1V, 6.1V, 14.5V, respectively. Over-current and/or short-circuit protection can also be achieved using over-power protection, in which the OPP pin is connected to the current transformer (driver transformer). The power-good signal is asserted to indicate the 3.3V, 5V, and 12V is above the undervoltage threshold level. PG pin goes high when the above condition is reached. A 2K pull-up resistor may connect to 5V. The VCC can be supplied from the 5V-standby. When the VCC voltage is higher than 7V, besides the shunt regulator, the circuit is shutdown and reset. No extra power supply is needed. Two internal high-precision 431 regulators are built-in to provide reference voltages. shunt stable 2. 7. Complete PWM control circuitry, including the error amplifier for push-pull or half-bridge operation. Supervisory Circuit Operation The PC generates the remote ON/OFF logic (PSON), which is LOW for power supply on and HIGH to switch off the power supply. The remote ON/OFF is connected to PSON input. © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 11 SG6105A — Power Supply Supervisor+Regulator+PWM Application Information Introduction The application guide shows the key features of SG6105A and illustrates how to design in an ATX switching mode power supply (SMPS). SG6105A is suitable for half-bridge, push-pull topology and incorporates with a four-channel supervisor, including 5V-standby. The PWM section of SG6105A comprises a built-in 65kHz oscillator and high-immunity circuits, which protect the system from noise interference and provide more noise margins for improper PCB layout. SG6105A has OVP and UVP for 12V, 5V, and 3.3V. NVP is used for negative voltage protection, such as – 12V and/or –5V. The UVAC (AC fails detection) is applied to detect AC line condition. Two built-in internal precision TL431 shunt regulators can be used for 3.3V or 5V auxiliary standby power. VDD OP1 OP2 R1 R2 C1 R3 OPP AC Fails Detection Through a resistor divider, UVAC is connected to the secondary power transformer for detecting the AC line condition. Once the voltage of UVAC is lower than 0.7V for a period of time, such as 200µs, the PG (powergood) signal is pulled low to indicate an AC line powerdown condition. The voltage amplitude of the PWM switching signal in the secondary power transformer is proportional to the AC line voltage. Adjust the ratio of resistor divider to decide the threshold of power-down warning. A small capacitor is connected from UVAC to ground for filtering the switching noise. VS VO Figure 18. OPP Protection Circuit Negative Voltage Protection (NVP) The NVP provides an under-voltage protection (UVP) for negative voltage outputs. An under-voltage represents the phenomenal of the overload condition in negative voltage output. For example, the –12V output may drop to –10V during the overload situation. A resistor determining the threshold of the protection is connected from pin NVP to the negative voltage output. Via this resistor, NVP outputs a 64µA constant current to the negative voltage output. When the NVP voltage is over 2.1V and the situation kept for longer than 7ms, SG6105A locks the power outputs off: VNVP=64µA × (R1 + R2) – V-12V (1) The power outputs are locked off when VNVP ≥ 2.1V. R1 0.7V UVAC R2 C1 Figure 19. NVP Protection Circuit Figure 17. AC Detection Circuit Over-Power Protection (OPP) The OPP is used for detecting over-power and/or shortcircuit conditions. When OPPS voltage (p.4, Note-1) is higher than 2.1V and this situation exists for longer than 7ms, SG6105A pulls the PG low and locks off the power outputs. © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 12 SG6105A — Power Supply Supervisor+Regulator+PWM Timing Diagram VCC PSON 3.3V,5V,12V tPSON(ON) NVP tPSON(OFF) tUVP tNVP SS(on/off) tPSOFF PG tPG VCC PSON Voltage < VUVAC UVAC OPP tOPP SS(on/off) PG Figure 20. Timing Diagram © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 13 SG6105A — Power Supply Supervisor+Regulator+PWM Reference Circuit Figure 21. Reference Circuit SG6105A © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 14 SG6105A — Power Supply Supervisor+Regulator+PWM BOM Reference D1,D2,D6 D3 D4,D5 D7,D8,D9,D10,D11 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 Component PR1004 2A45V 30C40 1N4148 62KΩ 1/8W 3.2KΩ 1/8W 510Ω 1% 1.5KΩ 1% 100Ω 1/8W 100Ω 1/8W 1KΩ 1/8W 47~100Ω 1KΩ 95.3KΩ 93.7KΩ 75 KΩ 14.2KΩ Reference R14 R15 R16 R17 R18 R19 R20 R21 R22 C1 C2,C5 C3,C6 C4 Q1 Q2,Q3 U1 U2 Component 100KΩ 1% 47KΩ 1/8W 9.47KΩ 1/8W 1.5KΩ 1% 1.45KΩ 1% 39Ω 1/8W 1KΩ 1/8W 96.7KΩ 1/8W 10KΩ 1/8W 101/50V 2.2µF/50V 103/50V 333/50V A928 2SC945 PC817 SG6105A © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 15 SG6105A — Power Supply Supervisor+Regulator+PWM Physical Dimensions 24.892-26.924 PIN #1 6.223-6.477 1.524 3.175-3.429 7.620 2.921-3.810 5.334 MAX 2.540 0.381 MIN 0-15 9.017 TYP 0.457 NOTES: A. CONFORMS TO JEDEC REGISTRATION MS-001, VARIATIONS AD B. ALL DIMENSIONS ARE IN MILLIMETERS C. DOES NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.25MM. D. DOES NOT INCLUDE DAMBAR PROTRUSIONS. DAMBAR PROTRUSIONS SHALL NOT EXCEED 0.25MM. E. DRAWING FILE NAME: N20SREV1 Figure 22. 20-Lead Dual Inline Package (DIP) Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the warranty therein, which covers Fairchild products. Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings: http://www.fairchildsemi.com/packaging/. © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 16 SG6105A — Power Supply Supervisor+Regulator+PWM © 2008 Fairchild Semiconductor Corporation SG6105A • Rev. 1.0.2 www.fairchildsemi.com 17