Buck or Boost, PWM Controller

for Battery Test Solutions

Data Sheet

ADP1972

Rev. B

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FEATURES

Input voltage range: 6 V to 60 V

On-board 5 V low dropout regulator

Selective buck or boost mode

Excellent PWM linearity with high amplitude PWM sawtooth

4.0 V p-p

FAULT input compatible with AD8450

COMP input compatible with AD8450

Adjustable frequency from 50 kHz to 300 kHz

Synchronization output or input with adjustable phase shift

Programmable maximum duty cycle

Maximum internal duty cycle: 98%

Programmable soft start

Peak hiccup current limit protection

Input voltage UVLO protection

TSD protection

16-lead TSSOP

APPLICATIONS

PWM battery test systems with recycle capability including

hybrid vehicles, PCs, and camera batteries

Compatible with AD8450 constant voltage (CV) and constant

current (CC) monitors

GENERAL DESCRIPTION

The ADP1972 is a constant frequency, voltage mode, pulse-width

modulation (PWM) controller for buck or boost, dc-to-dc,

asynchronous applications. The ADP1972 is designed for use in

asynchronous battery testing applications with an external, high

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

external control device, such as the AD8450. The asynchronous

device operates as a buck converter in battery charge mode and

operates as a boost converter in recycle mode to recycle energy

to the input bus.

The ADP1972 high voltage, VIN supply pin can withstand a

maximum operating voltage of 60 V and reduces the need for

additional system supply voltages. The ADP1972 has integrated

features such as precision enable, pin selective buck or boost

mode operation, internal and external synchronization control

with programmable phase shift, programmable maximum duty

cycle, and programmable peak hiccup current limit. Additional

protection features include soft start to limit input inrush current

during startup, input voltage undervoltage lockout (UVLO),

and thermal shutdown (TSD). The ADP1972 also has a COMP

pin to provide external control of the PWM operation and a

FAULT pin that can be signaled to disable the DH and DL

outputs if a fault condition occurs externally to the ADP1972.

The ADP1972 is available in a 16-lead TSSOP package.

TYPICAL APPLICATION CIRCUIT

DH

DL

CL

GND

24V RECYLCING

DC BUS

VIN

24V

EN

COMP

FAULT

MODE

FROM

CENTRAL PC

FROM

ANALOG IC

ADP1972

VREG

FREQ

SYNC

DMAX

SCFG

SS

HV

MOSFET

DRIVER

Figure 1.