HV9904 Datasheet, PDF (1/5 Pages) Supertex, Inc – HV9904 Multi Converter Controller

HV9904
Preliminary Engineering Specification
HV9904 Multi Converter Controller
Features
General Description
‰ Eliminates High Voltage Input Electrolytic Capacitor
‰ Smallest and Most Reliable Off-Line Solution
‰ Constant Current or Constant Voltage Mode Control
‰ Can be Operated Directly from Rectified AC Mains
‰ 10V to 400V Input Range Internal Regulator
‰ 1.5mA Operating Supply Current
‰ PLL Based Loop Control with Soft Start
‰ On-Time Varies Inversely with Input Voltage
‰ Frequency Varies with Load
‰ 2.5V Differential Sense
‰ Recommended for <10W Applications
Applications
‰ Universal Input Voltage LED driver
‰ Constant Current Source
‰ Battery Charger
Ordering Information
Package Options
8 Pin Plastic DIP
8 Pin SOIC
HV9904P
HV9904LG
Dice
HV9904X
The Supertex HV9904 is a second order PWM controller designed
to provide a constant average current output or a constant average
voltage output from an input of 10V to 400V DC or directly from
rectified AC mains up to 280V. The second order topology is
capable of extremely high dynamic control range, allowing
operation directly from rectified AC mains without the need for
bulky and expensive high voltage input electrolytic capacitor.
The PWM control utilizes feed forward circuitry to compensate for
large variations in input voltage (i.e. rectified AC) and a novel
integrator lock loop PLL scheme to regulate a differentially sensed
feedback node where the signal may be discontinuous. This
feedback node could be a current sense resistor or divider from
regulated output voltage. For a constant load the switching
frequency will be nearly constant with a dither of a few kHz helping
to meet FCC conducted emissions requirements.
A high input voltage linear regulator provides a stable Vdd supply
for the internal circuitry and gate drive to the external MOSFET.
Under voltage lockout provides a power on reset and protection for
the MOSFET
Typical Application Circuit
Universal Input Constant Average Currrent LED Lamp Power Supply
10VDC to 400VDC
or
VAC to 265V
1N4007
D1 D2
D5
D6
MURS120T3 MURS120T3
L2
220uH
D4 D3
C3
0.01uF
D7
MURS120T3
C1
0.1uF
400V
L1
1mH
U1
Vdd ^+Vin GATE ^M1
NS
HV9904
C2
PS
1uF
AGND PGND
VN2460N8
or
IRFBC30AS
C4
0.1uF
10mA
1 to 8
LEDs
R1
250
Prepare by Telecom Group
1
Rev. D
3/29/2002
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: [phone] FAX: [phone] www.supertex.com