Bidirectional, Synchronous PWM Controller
for Battery Test and Formation
Data Sheet
ADP1974
Rev. 0 Document Feedback
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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
VCTRLMODE
FAULT
ISVPISVNBVN0BVP0
++––
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
BATTERY
12699-001
DT
NOTES
1. THE AD8450 AND ADuM7223 ARE SIMPLIFIED REPRESENTATIONS.
Figure 1.
