HV9123_14 Datasheet, PDF (1/11 Pages) Supertex, Inc – High-Voltage,Current-Mode PWM Controller

Supertex inc.
HV9123
High-Voltage,
Current-Mode PWM Controller
Features
►► 10 to 450V input voltage range
►► <1.3mA supply current
►► >1.0MHz clock
►► >20:1 dynamic range @ 500kHz
►► 99% Maximum duty cycle version
►► Low internal noise
Applications
►► Off-line high frequency power supplies
►► Universal input power supplies
►► High density power supplies
►► Very high efficiency power supplies
►► Extra wide load range power supplies
General Description
The Supertex HV9123 is a Switch Mode Power Supply
(SMPS) controller subsystem that can start and run directly
from almost any DC input, from a 12V battery to a rectified
and filtered 240VAC line. It contains all the elements required
to build a single-switch converter except for the switch,
magnetic assembly, output rectifier(s) and filter(s).
A unique input circuit allows the HV9123 to self-start directly
from a high voltage input, and subsequently take the power
to operate from one of the outputs of the converter it is
controlling, allowing very efficient operation while maintaining
input-to-output galvanic isolation limited in voltage only by
the insulation system of the associated magnetic assembly.
A ±2% internal bandgap reference, internal operational
amplifier, very high speed comparator, and output buffer
allow production of rugged, high performance, high efficiency
power supplies of 50W or more, which can still be over 80%
efficient at outputs of 1.0W or less. The wide dynamic range of
the controller system allows designs with extremely wide line
and load variations with much less difficulty and much higher
efficiency than usual. The exceptionally wide input voltage
range also allows better usage of energy stored in input
dropout capacitors than with other PWM ICs. Remote on/off
controls allow either latching or nonlatching remote shutdown.
During shutdown, the power required is under 6.0mW.
For detailed circuit and application information, please
refer to application notes AN-H13, AN-H21 to AN-H24.
Functional Block Diagram
FB
15 (19)
COMP DISCHARGE
OSC
IN
OSC
OUT
8 (10)
11 (14)
VREF
16 (20)
BIAS
7 (9)
VDD
Error
Amplifier
–
+
2V _–
4V
REF
GEN
Current
Sources
+
+
To
Internal
–
Circuits
1.2V
OSC
Modulator
Comparator
R
Q
S
Current Limit
Comparator
1 (3)
+VIN
–
8.1V
+
8.6V
Pre-regulator/Startup
Note:
Pin numbers in parentheses are for PLCC package.
Undervoltage
Comparator
S
Q
R
Doc.# DSFP-HV9123
C031314
To VDD
5 (6)
OUTPUT
6 (8)
-VIN
4 (5)
SENSE
V_DD
12 (16)
SHUTDOWN
13 (17)
RESET
Supertex inc.
www.supertex.com