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Analog Devices Semiconductor Electronic Components Datasheet

ADP1972 Datasheet

PWM Controller

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Data Sheet
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
Buck or Boost, PWM Controller
for Battery Test Solutions
ADP1972
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
24V
VIN
VREG
SYNC
SCFG
FROM
CENTRAL PC
FROM
ANALOG IC
MODE
DH
EN
ADP1972
COMP
DL
FAULT
CL
FREQ
DMAX
GNDSENSE
GND
SS
HV
MOSFET
DRIVER
24V RECYLCING
DC BUS
Figure 1.
Rev. B
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Analog Devices Semiconductor Electronic Components Datasheet

ADP1972 Datasheet

PWM Controller

No Preview Available !

ADP1972
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Typical Application Circuit ............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Thermal Operating Ranges ......................................................... 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 10
Supply Pins .................................................................................. 10
EN/Shutdown.............................................................................. 11
Undervoltage Lockout (UVLO) ............................................... 11
Soft Start ...................................................................................... 11
Operating Modes........................................................................ 11
REVISION HISTORY
11/14—Rev. A to Rev. B
Changes to EN Threshold Falling Parameter, Unit
Column, Table 1................................................................................ 4
Changes to the Programming Maximum Duty Cycle Section...... 15
6/14—Rev. 0 to Rev. A
Changes to Maximum Duty Cycle Range Parameter, Table 1 .... 3
Changes to Equation 7 and Equation 9 ....................................... 15
Changes to Ordering Guide .......................................................... 18
1/14—Revision 0: Initial Version
Data Sheet
PWM Drive Signals.................................................................... 12
External COMP Control ........................................................... 12
Current Limit.............................................................................. 12
PWM Frequency Control.......................................................... 12
Maximum Duty Cycle ............................................................... 13
External Fault Signaling ............................................................ 13
Thermal Shutdown (TSD) ........................................................ 13
Applications Information .............................................................. 14
Buck or Boost Selection............................................................. 14
Selecting RS to Set the Current Limit....................................... 14
Adjusting the Operating Frequency ........................................ 14
Programming the Maximum Duty Cycle ............................... 15
Adjusting the Soft Start Period................................................. 16
PCB Layout Guidelines.................................................................. 17
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 18
Rev. B | Page 2 of 18


Part Number ADP1972
Description PWM Controller
Maker Analog Devices
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ADP1972 Datasheet PDF






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