Buck or Boost, PWM Controller
for Battery Test Solutions
Data Sheet
ADP1972
Rev. B Document Feedback
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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
GND
SENSE
HV
MOSFET
DRIVER
BATTERY
11884-001
Figure 1.
