NCP1032 Datasheet, PDF (1/21 Pages) ON Semiconductor – Low Power PWM Controller

NCP1032
Low Power PWM Controller
with On-Chip Power Switch
and Startup Circuits for
Telecom Systems
The NCP1032 is a miniature high−voltage monolithic switching
converter with on−chip power switch and startup circuits. It
incorporates in a single IC all the active power control logic and
protection circuitry required to implement, with minimal external
components several switching regulator applications, such as a
secondary side bias supply or a low power DC−DC converter. This
converter is ideally suited for 24 V and 48 V telecom and medical
isolated power supply applications. The NCP1032 can be configured
in any single−ended topology such as forward or flyback converter.
The NCP1032 is targeted for applications requiring up to 3 W.
The internal error amplifier allows the NCP1032 to be easily
configured for secondary or primary side regulation operation in
isolated and non−isolated configurations. The fixed frequency
oscillator is optimized for operation up to 1 MHz and is capable of
external frequency synchronization, providing additional design
flexibility. In addition, the NCP1032 incorporates undervoltage and
overvoltage line detectors, programmable cycle−by−cycle current
limit, internal soft−start, and thermal shutdown to protect the
controller under fault conditions.
Features
• On Chip High 200 V Power Switch Circuit and Startup Circuit
• Internal Startup Regulator with Auxiliary Winding Override
• Programmable Oscillator Frequency Operation up to 1 MHz
• External Frequency Synchronization Capability
• Frequency Fold−down Under Fault Conditions
• Trimmed ± 2% Internal Reference
• Programmable Cycle−by−Cycle Current Limit
• Internal Soft−Start
• Active Leading Edge Blanking Circuit
• Line Under and Over Voltage Protection
• Over Temperature Protection
• These are Pb−Free Devices
Typical Applications
• POE (Power Over Ethernet)/PD. Refer to Application Note AND8247
• Secondary Side Bias Supply for Isolated DC−DC Converters
• Stand Alone Low Power DC−DC Converter
• Low Power Bias Supply
• Low Power Boost Converter
• Medical Isolated Power Supplies
• Bias Supply for Telecom Systems. Refer to App Note AND8119/D
http://onsemi.com
MARKING
DIAGRAMS
WDFN8
1032x
1
MN SUFFIX
CASE 511BH
ALYW G
G
1032 = Specific Device Marking
x = A or B
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
GND
Ç_CT
Ç _VFB
ÇÇ _COMP
ÇÇÇÇÇÇÇÇ _GND
V_DRAIN
V_CC
UV/OV
CL
WDFN8 (Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 20 of this data sheet.
© Semiconductor Components Industries, LLC, 2014
1
May, 2014 − Rev. 2
Publication Order Number:
NCP1032/D