PTQB425080N3AD

Not Recommended for New Designs PTQB425080 www.ti.com SLTS269B – DECEMBER 2006 – REVISED NOVEMBER 2007 200-W 48-V INPUT, 8-V OUTPUT, SEMI-REGULATED, ISOLATED DC-DC BUS CONVERTER Check for Samples: PTQB425080 FEATURES 1 • • • • • • • • • • • • • • • DESCRIPTION 200-W Output Input Voltage Range: 36 V to 75 V Meets 100 V, 100 ms Input Transient 6:1 Input-to-Output DC Conversion Ratio: 36 V to 55 V Input 10.5 V Output Voltage Limit: > 55 V Input 93% Efficiency 1500 VDC Isolation On/Off Control Overcurrent Protection Over-Temperature Shutdown Undervoltage Lockout SmartSync External Clock Drive (Optional) AutoTrack™ Power-Up Sequencing (Optional) Standard 1/4-Brick Bus Converter Footprint UL Safety Agency Approval The PTQB425080 power module is single-output isolated DC/DC converter, housed in an industry standard quarter-brick package. The module is nominally rated up to 200 W with a maximum load current of 25 A. It delivers an output voltage of 1/6th the input voltage for an input voltage range of 36 V to 55 V, while limiting the output voltage to 10.5 V for an input voltage greater than 55 V. The PTQB425080 operates from a standard 48-V telecom central office (CO) supply and occupies only 3.3 in2 of PCB area. The module offers OEMs a compact and flexible high-output power source in an industry standard footprint. It is suitable for distributed power applications in both telecom and computing environments that utilize an intermediate bus architecture (IBA), and may be used for powering downstream point-of-load (POL) devices such as the second generation PTH series of products (T2). Features include a remote On/Off control with optional logic polarity, and an undervoltage lockout (UVLO). Protection features include output overcurrent protection (OCP) and over-temperature protection (OTP). To compliment T2-POL products, optional features include a SmartSync compatible clock drive and a AutoTrack™ power-up sequencing manager The module is fully integrated for stand-alone operation, and require no additional components. STANDARD APPLICATION +VO +VI 1 +VI +VO 7 + + PTQB425080N CI (Optional) −VI 3 −VI CO (Optional) −VO Remote On/Off 2 4 Point−of−Load Power Module Inputs −VO UDG−06086 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2006–2007, Texas Instruments Incorporated Not Recommended for New Designs PTQB425080 SLTS269B – DECEMBER 2006 – REVISED NOVEMBER 2007 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. ORDERING INFORMATION For the most current package and ordering information, see the Package Option Addendum at the end of this datasheet, or see the TI website at www.ti.com. Table 1. PART NUMBERING SCHEME Input Voltage PTQB Output Current 4 4 = 48 V Output Voltage 25 25 = 25A Enable 080 Electrical Options N 080 = 8 V 2 Pin Style A N = Negative 2 = Standard P = Positive 3 = SmartSync Clock Drive and AutoTrack™ Enable D D = Through-hole, Pb-free ABSOLUTE MAXIMUM RATING UNIT TA VI, MAX PO, Operating Temperature Range Maximum Input Voltage Maximum Output Power –40°C to 85°C (1) Over VI Range Continuous voltage 75 V Peak voltage for 100 ms duration 100 V VI = 48 V 200 W MAX TS Storage Temperature –40°C to 125°C Mechanical Shock Per Mil-STD-883, Method 2002.3 1 ms, 1/2 Sine, mounted AD Suffix 250 G Mechanical Vibrarion Per Mil-STD-883, Method 2007.2 20-2000 Hz, PCB mounted AD Suffix 15 G Weight Flammability (1) 2 30 grams Meets UL 94V-O See SOA curves or consult factory for appropriate derating. Submit Documentation Feedback Copyright © 2006–2007, Texas Instruments Incorporated Product Folder Links: PTQB425080 Not Recommended for New Designs PTQB425080 www.ti.com SLTS269B – DECEMBER 2006 – REVISED NOVEMBER 2007 ELECTRICAL CHARACTERISTICS PTQB425080 (Unless otherwise stated, TA = 25°C, VI = 48 V, VO = 8 V, CO = 10 μF, and IO = IOmax PARAMETER TEST CONDITIONS MIN IO Output Current Over VI range 0 VI Input Voltage Range Over IO range 36 VO tol Output Voltage Tolerance Over VI and IO range 5.4 36 ≤ VI ≤ 55 V TYP 48 MAX UNIT 25 A 75 V 10.5 0.17 V V/V Regline Line Regulation 55 < VI ≤ 75 V, VO = 9.5 V 10 % Regload Load Regulation Over IO range 40 mV/A η Efficiency IO = IOmax VR VO Ripple (pk-pk) 20 MHz bandwidth ITRIP Overcurrent Threshold Shutdown, followed by auto-recovery OTP Over Temperature Protection Temperature Measurement at thermal sensor. Hysteresis = 10°C nominal. fs Switching Frequency Over VI range UVLO Undervoltage Lockout 93% 100 mVpp 35 A 125 °C 275 kHz VOFF VI decreasing, IO = 10 A 32.5 VHYS Hysteresis 1.5 V On/Off Input: Negative Enable VIH Input High Voltage VIL Input Low Voltage IIL Input Low Current Referenced to –VI 2.4 Open (1) –0.2 0.8 –0.3 V mA On/Off Input: Positive Enable 4.5 Open (1) –0.2 0.8 VIH Input High Voltage VIL Input Low Voltage IIL Input Low Current IISB Standby Input Current Output disabled (pin 2 status set to Off) CI External Input Capacitance Between +VI and –VI 0 CO External Output Capacitance Between +VO and –VO 0 Isolation Voltage Input-to-output and input-to-case Isolation Capacitance Input-to-output Isolation Resistance Input-to-output SmartSync Clock Drive (pin 5) TTL Output signal for synchronizing POL modules fss (1) Referenced to –VI V –0.5 mA 3 mA 100 μF 3000 1500 μF Vdc 500 10 pF MΩ Signal Amplitude 5 Signal Frequency 275 Vpk-pk kHz The Remote On/Off input has an internal pull-up and may be controlled with an open collector (drain) interface. An open circuit correlates to a logic high. Consult the application notes for interface considerations. Submit Documentation Feedback Copyright © 2006–2007, Texas Instruments Incorporated Product Folder Links: PTQB425080 3 Not Recommended for New Designs PTQB425080 SLTS269B – DECEMBER 2006 – REVISED NOVEMBER 2007 www.ti.com TERMINAL FUNCTIONS TERMINAL NAME DESCRIPTION NO. +VI (1) 1 The positive input for the module with respect to -VI. When powering the module from a negative input voltage, this input is connected to the input source ground. –VI (1) 3 The negative input supply for the module, and the 0-V reference for the enable input. When powering the module from a positive source, this input is connected to the input source return. Remote On/Off 2 This input controls the On/Off status of the output voltage. It is either driven low (–VI potential), or left open-circuit. For units identified with the N (negative logic) option, applying a logic low to this pin enables the output. And for units identified with the P (positive logic) option, the output is disabled. +VO 7 This is the positive power output with respect to –VO. It is isolated from the input power pins and produces a valid output voltage approximately 80 ms before the voltage at the Track terminal is allowed to rise. This provides the required standby power source to any downstream nonisolated modules in power-up sequencing applications. –VO 4 This is the output power return for both the +VO output voltage. This terminal should be connected to the common of the load circuit. AutoTrack™ Enable (Optional) 6 This terminal may be used in power-up sequencing applications to control the output voltage of Auto-Track compatible modules, powered from the converter +VO output. The converter Track control has an internal, opencollector transistor, which holds the voltage close to –VO potential for approximately 80 ms after the +VO output is in regulation. Following this delay, the Track voltage rises simultaneously with the output voltages of all other modules controlled by Auto-Track. See Application Information for more details. SmartSync Clock Drive (Optional) 5 This terminal sources a 275kHz clock signal that can be used to synchronize the switching frequency of multiple downstream point-of-load power modules. Frequency synchronization eliminates beat frequencies and reduces the external filtering requirement. See Application Information for more details. (1) These functions indicate signals electrically common with the input. spacer PTQB425080x3 1 2 3 4 +VO Track +VI 7 6 1 2 On/Off −VI PTQB425080x2 SmartSync −VO 5 4 3 Submit Documentation Feedback +VI +VO 7 On/Off −VI −VO 4 Copyright © 2006–2007, Texas Instruments Incorporated Product Folder Links: PTQB425080 Not Recommended for New Designs PTQB425080 www.ti.com SLTS269B – DECEMBER 2006 – REVISED NOVEMBER 2007 TYPICAL CHARACTERISTICS PTQB425080 (1) (2) EFFICIENCY vs LOAD CURRENT POWER DISSIPATION vs LOAD CURRENT AMBIENT TEMPERATURE vs LOAD CURRENT 90 20 100 VI = 48 V 600 LFM VI = 75 V 18 95 80 h - Efficiency - % 90 85 VI = 75 V VI = 36 V 80 75 VI 70 VI = 48 V 14 12 10 8 6 VI 4 36 V 48 V 75 V 65 36 V 48 V 75 V 2 5 10 15 IO - Output Current - A 20 5 0 25 100 LFM 60 Natural Convection 50 VI = 48 V LFM 40 0 100 200 400 600 400 LFM 20 10 15 20 IO - Output Current - A Figure 1. 200 LFM 70 30 VI = 36 V 0 60 0 TA - Ambient Temperature - °C PD - Power Dissipation - W 16 25 0 5 10 15 20 IO - Output Current - A Figure 2. 25 Figure 3. LINE REGULATION LOAD REGULATION 12 12 IO = 12 A VI = 60 V VI = 75 V 10 10 VO - Output Voltage - V VO - Output Voltage - V IO = 0 A 8 6 IO = 25 A 4 8 6 4 VI = 36 V IO 0 36 36 V 48 V 60 V 75 V 0 42 48 54 60 66 72 78 0 VI – Input Voltage – V (2) 5 10 15 20 25 IO - Output Current - A Figure 4. (1) VI 2 0A 12 A 25 A 2 VI = 48 V Figure 5. All data listed in Figure 1, Figure 2, Figure 4, and Figure 5 have been developed from actual products tested at 25°C. This data is considered typical data for the dc-dc converter. The temperature derating curves represent operating conditions at which internal components are at or below manufacturer's maximum rated operating temperature. Derating limits apply to modules soldered directly to a 100–mm × 100–mm, double-sided PCB with 2 oz. copper. For surface mount packages, multiple vias (plated through holes) are required to add thermal paths around the power pins. Please refer to the mechanical specification for more information. Applies to Figure 3. Submit Documentation Feedback Copyright © 2006–2007, Texas Instruments Incorporated Product Folder Links: PTQB425080 5 Not Recommended for New Designs PTQB425080 SLTS269B – DECEMBER 2006 – REVISED NOVEMBER 2007 www.ti.com APPLICATION INFORMATION Operating Features and System Considerations for the PTQB425080 Series of DC/DC Converters Overcurrent Protection To protect against load faults, these converters incorporate output overcurrent protection. Applying a load to the output that exceeds the converter's overcurrent threshold (see applicable specification) causes the output voltage to momentarily fold back, and then shut down. Following shutdown the module periodically attempts to automatically recover by initiating a soft-start power-up. This is often described as a hiccup mode of operation, whereby the module continues in the cycle of successive shutdown and power up until the load fault is removed. Once the fault is removed, the converter automatically recovers and returns to normal operation. Overtemperature Protection Overtemperature protection is provided by an internal temperature sensor, which closely monitors the temperature of the converter’s printed circuit board (PCB). If the sensor exceeds a temperature of approximately 125°C, the converter shuts down. The converter then automatically restarts when the sensed temperature drops back to approximately 95°C. When operated outside its recommended thermal derating envelope (see data sheet SOA curves), the converter typcially cycles on and off at intervals from a few seconds to one or two minutes. This is to ensure that the internal components are not permanently damaged from excessive thermal stress. Undervoltage Lockout The Undervoltage lockout (UVLO) is designed to prevent the operation of the converter until the input voltage is at the minimum input voltage. This prevents high start-up current during normal power-up of the converter, and minimizes the current drain from the input source during low input voltage conditions. The UVLO circuitry also overrides the operation of the Remote On/Off control. Primary-Secondary Isolation The converter incorporates electrical isolation between the input terminals (primary) and the output terminals (secondary). All converters are production tested to a withstand voltage of 1500 VDC. This specification complies with UL60950 and EN60950 requirements. This allows the converter to be configured for either a positive or negative input voltage source. The data sheet Pin Descriptions section provides guidance as to the correct reference that must be used for the external control signals. Input Current Limiting The converter is not internally fused. For safety and overall system protection, the maximum input current to the converter must be limited. Active or passive current limiting can be used. Passive current limiting can be a fast acting fuse. A 125-V fuse, rated no more than 10 A, is recommended. Active current limiting can be implemented with a current limited Hot-Swap controller. Thermal Considerations Airflow may be necessary to ensure that the module can supply the desired load current in environments with elevated ambient temperatures. The required airflow rate may be determined from the Safe Operating Area (SOA) thermal derating chart (see typical characteristics). 6 Submit Documentation Feedback Copyright © 2006–2007, Texas Instruments Incorporated Product Folder Links: PTQB425080 Not Recommended for New Designs PTQB425080 www.ti.com SLTS269B – DECEMBER 2006 – REVISED NOVEMBER 2007 Using the Remote On/Off Function on the PTQB425080 Series of DC/DC Converters For applications requiring output voltage On/Off control, the PTQB425080 series of DC/DC converters incorporate a Remote On/Off control (pin 2). This feature can be used to switch the module off without removing the applied input source voltage. When placed in the Off state, the standby current drawn from the input source is typically reduced to 3 mA. Negative Output Enable (N Option) Models using the negative enable option, the Remote On/Off (pin 2) control must be driven to a logic low voltage for the converter to produce an output. This is accomplished by either permanently connecting pin 2 to –VI (pin 3), or driving it low with an external control signal. Table 2 shows the input requirements of pin 2 for those modules with the NEN option. Table 2. On/Off Control Requirements for Negative Enable PARAMETER MIN TYP MAX VIH Disable 2.4 V 20 V VIL Enable –0.2 V 0.8 V Vo/c Open-Circuit II Pin 2 at –VI 9V 15 V –0.75 mA Positive Output Enable (P Option) For those models with the positive enable option, leaving pin 2 open circuit, (or driving it to an equivalent logic high voltage), enables the converter output. This allows the module to produce an output voltage whenever a valid input source voltage is applied to +VI with respect to –VI. If a logic-low signal is then applied to pin 2 the converter output is disabled. Table 3 gives the input requirements of pin 2 for modules with the PEN option. Table 3. On/Off Control Requirements for Positive Enable PARAMETER MIN TYP MAX VIH Enable 4.5 V 20 V VIL Disable –0.2 V 0.8 V Vo/c Open-Circuit II Pin 2 at –VI 5V 7V –0.5 mA Notes: 1. The Remote On/Off control uses –VI (pin 3) as its ground reference. All voltages are with respect to –VI. 2. An open-collector device (preferably a discrete transistor) is recommended. A pull-up resistor is not required. If one is added the pull-up voltage should not exceed 20 V. Caution: Do not use a pull-resistor to +VI (pin 1). The remote On/Off control has a maximum input voltage of 20 V. Exceeding this voltage can overstress, and possibly damage, the converter. 3. The Remote On/Off pin may be controlled with devices that have a totem-pole output. This is provided the output high level voltage (VOH) meets the module's minimum VIH specified in Table 2. If a TTL gate is used, a pull-up resistor may be required to the logic supply voltage. 4. The converter incorporates an undervoltage lockout (UVLO). The UVLO keeps the converter off until the input voltage is close to the minimum specified operating voltage. This is regardless of the state of the Remote On/Off control. Consult the product specification for the UVLO input voltage thresholds. Submit Documentation Feedback Copyright © 2006–2007, Texas Instruments Incorporated Product Folder Links: PTQB425080 7 Not Recommended for New Designs PTQB425080 SLTS269B – DECEMBER 2006 – REVISED NOVEMBER 2007 www.ti.com PTQB425080P 2 1 = Disable Remote On/Off Q1 BSS138 −VI 3 −VI UDG−06085 Figure 6. Recommended Control for Remote On/Off Input Turn-On: With a valid input source voltage applied, the converter produces a regulated output voltage within 75 ms of the output being enabled. Figure 7 shows the output response of the PTQB425080P following the removal of the logic-low signal from the Remote On/Off (pin 2); see Figure 6. This corresponds to the drop in Q1 VGS in Figure 7. Although the rise-time of the output voltage is short (