Bidirectional, Synchronous PWM Controller

for Battery Test and Formation

Data Sheet

ADP1974

Rev. 0

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FEATURES

Input voltage range: 6 V to 60 V

On-board 5 V linear regulator

Buck/charge or boost/discharge mode

High PWM linearity with internal 4 V p-p PWM ramp voltage

FAULT and COMP input compatible with AD8450/AD8451

Programmable dead time control

Adjustable frequency from 50 kHz to 300 kHz

Synchronization output or input with adjustable phase shift

Programmable maximum duty cycle

Programmable soft start

Peak hiccup current-limit protection

Pin-compatible with ADP1972 (asynchronous version)

TSD protection

16-lead TSSOP

APPLICATIONS

Single and multicell battery formation and testing

High efficiency battery test systems with recycle capability

Battery conditioning (charging and discharging) systems

Compatible with AD8450/AD8451 constant voltage (CV) and

constant current (CC) analog front end error amplifier

GENERAL DESCRIPTION

The ADP1974 is a constant frequency, voltage mode, synchronous,

pulse-width modulation (PWM) controller for bidirectional dc-to-

dc applications. The ADP1974 is designed for use in battery testing,

formation, and conditioning applications with an external, high

voltage field effect transistor (FET) half bridge driver, and an

external control device such as the AD8450/AD8451. The device

operates as a buck converter in battery charge mode and as a boost

converter in discharge mode to recycle energy to the input bus.

The ADP1974 high voltage VIN supply pin can withstand a

maximum operating voltage of 60 V and reduces the need for

additional system supply voltages. The ADP1974 has integrated

features such as precision enable, internal and external

synchronization control with programmable phase shift,

programmable maximum duty cycle, dead time control, and peak

hiccup current-limit protection. Additional protection features

include soft start to limit input inrush current during startup,

precision enable, and thermal shutdown (TSD). The ADP1974

also has a COMP pin to provide external control of the PWM

duty cycle and a FAULT pin that can disable the DH and DL

outputs. These functions are compatible with the AD8450/AD8451

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

DH

DL

CL

GND

+24V RECYLCING DC BUS

VIN

+24V

MODE

COMP

FAULT

VCTRL

MODE

FAULT

ISVP

ISVN

BVN0

BVP0

++

––

ISET

ON/OFF

VOLTAGE

SETPOINT

CURRENT

SETPOINT

LOOP

COMPENSATION

BATTERY CHARGER SYSTEM CONTROL

CHARGE/

DISCHARGE

VSET

EN

ADP1974

AD8450

VREG

FREQ

SYNC

DMAX

SCFG

SS

HV

MOSFET

DRIVER

ADuM7223

DT

NOTES

1. THE AD8450 AND ADuM7223 ARE SIMPLIFIED REPRESENTATIONS.

Figure 1.