HV9930_11 Datasheet, PDF (1/7 Pages) Supertex, Inc – Hysteretic Boost-Buck (Ćuk) LED Driver IC

Supertex inc.
HV9930
Hysteretic Boost-Buck (Ćuk)
LED Driver IC
Features
XX Constant output current LED driver
XX Steps output voltage up or down
XX Low EMI
XX Variable frequency operation
XX Internal 8.0 - 200V linear regulator
XX Input and output current sensing
XX Input current limit
XX Enable & PWM dimming
Applications
XX RGB backlight applications
XX Battery powered LED lamps
XX Other low voltage AC/DC or DC/DC LED drivers
General Description
The HV9930 is a variable frequency PWM controller IC,
designed to control an LED lamp driver using a low-noise
boost-buck (Ćuk) topology. The HV9930 uses a patent-pending
hysteretic current-mode control to regulate both the input and
output currents. This enables superior input surge immunity
without the necessity for complex loop compensation. Input
current control enables current limiting during startup, input
under-voltage and output overload conditions. The HV9930
provides a low-frequency PWM dimming input that can accept
an external control signal with a duty cycle of 0 - 100% and a
high dimming ratio.
The HV9930 based LED driver is ideal for LED lamps and
RGB backlight applications with low voltage DC inputs. The
HV9930 based LED Lamp drivers can achieve efficiency in
excess of 80%.
Typical Application Circuit
C₁
D₂
L₁
R_D
C_D
L₂
-
VDC
Q₁
D₁
D₃
VO
R_CS1
R_CS2
+
R_S1
R_REF1
C₂
VIN
VDD
GATE
PWMD
CS1
CS2
GND
REF
HV9930
R_S2A
R_S2B
R_REF2
C3
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: [phone] ● www.supertex.com