Bidirectional, Synchronous PWM Controller for Battery Test and Formation Data Sheet ADP1974 FEATURES GENERAL DESCRIPTION Input voltage range: 6 V to 60 V The ADP1974 is a constant frequency, voltage mode, synchronous, On-board 5 V linear regulator pulse-width modulation (PWM) controller for bidirectional dc-to- Buck/charge or boost/discharge mode dc applications. The ADP1974 is designed for use in battery testing, High PWM linearity with internal 4 V p-p PWM ramp voltage formation, and conditioning applications with an external, high FAULT and COMP input compatible with AD8450/AD8451 voltage field effect transistor (FET) half bridge driver, and an Programmable dead time control external control device such as the AD8450/AD8451. The device Adjustable frequency from 50 kHz to 300 kHz operates as a buck converter in battery charge mode and as a boost Synchronization output or input with adjustable phase shift converter in discharge mode to recycle energy to the input bus. Programmable maximum duty cycle The ADP1974 high voltage VIN supply pin can withstand a Programmable soft start maximum operating voltage of 60 V and reduces the need for Peak hiccup current-limit protection additional system supply voltages. The ADP1974 has integrated Pin-compatible with ADP1972 (asynchronous version) features such as precision enable, internal and external TSD protection synchronization control with programmable phase shift, 16-lead TSSOP programmable maximum duty cycle, dead time control, and peak hiccup current-limit protection. Additional protection features APPLICATIONS include soft start to limit input inrush current during startup, Single and multicell battery formation and testing precision enable, and thermal shutdown (TSD). The ADP1974 High efficiency battery test systems with recycle capability also has a COMP pin to provide external control of the PWM Battery conditioning (charging and discharging) systems duty cycle and a FAULT pin that can disable the DH and DL Compatible with AD8450/AD8451 constant voltage (CV) and outputs. These functions are compatible with the AD8450/AD8451 constant current (CC) analog front end error amplifier analog front-end (AFE) error amplifiers. The ADP1974 is available in a 16-lead TSSOP package and is pin-compatible with the ADP1972. TYPICAL APPLICATION CIRCUIT VIN +24V SYNC BATTERY CHARGER SYSTEM CONTROL +24V RECYLCING DC BUS VREG SCFG VOLTAGE CURRENT CHARGE/ DISCHARGE ON/OFF SETPOINT SETPOINT DH EN HV ADP1974 MOSFET DRIVER MODE DL ADuM7223 COMP ISET MODE VCTRL FAULT VSET FAULT CL AD8450 FREQ DT LOOP DMAX SS COMPENSATION GND BVP0 BVN0 ISVN ISVP ++ NOTES 1. THE AD8450 AND ADuM7223 ARE SIMPLIFIED REPRESENTATIONS. Figure 1. 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BATTERY 12699-001ADP1974 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 External COMP Control ........................................................... 12 Applications ....................................................................................... 1 Peak Current-Limit Hiccup Implementation ......................... 12 General Description ......................................................................... 1 Negative Current-Limit Detection (Buck Mode) .................. 13 Typical Application Circuit ............................................................. 1 PWM Frequency Control .......................................................... 13 Revision History ............................................................................... 2 Maximum Duty Cycle ............................................................... 13 Specif icat ions ..................................................................................... 3 External Fault Signaling ............................................................ 13 Absolute Maximum Ratings ............................................................ 5 Thermal Shutdown (TSD) ........................................................ 13 Thermal Operating Ranges ......................................................... 5 Applications Information .............................................................. 14 ESD Caution .................................................................................. 5 Buck or Boost Selection ............................................................. 14 Pin Configuration and Function Descriptions ............................. 6 Selecting RS to Set the Current Limit ....................................... 14 Typical Performance Characteristics ............................................. 7 Adjusting the Operating Frequency ........................................ 14 Theory of Operation ...................................................................... 10 Programming the Maximum Duty Cycle ............................... 16 Supply Pins .................................................................................. 10 Adjusting the Soft Start Period ................................................. 16 EN/Shutdown .............................................................................. 11 PCB Layout Guidelines .................................................................. 18 Undervoltage Lockout (UVLO) ............................................... 11 Outline Dimensions ....................................................................... 19 Soft Start ...................................................................................... 11 Ordering Guide .......................................................................... 19 Operating Modes ........................................................................ 11 PWM Drive Signals .................................................................... 12 REVISION HISTORY 9/15Revision 0: Initial Version Rev. 0 Page 2 of 19