HV9930 Datasheet, PDF (1/7 Pages) Supertex, Inc – Hysteretic Boost-Buck (Cuk) LED Driver ICs

HHVV99993300
Hysteretic Boost-Buck (Čuk) LED Driver ICs
Features
Constant Output Current
Steps Output Voltage Up or Down
Low EMI
Variable Frequency Operation
Internal 8 to 200V Linear Regulator
Input and output current sensing
Input Current limit
Enable & PWM Dimming
Applications
Automotive LED Drivers
RGB backlight applications
Battery Powered LED Lamps
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 (Cuk) topology. The HV9930 uses hysteretic-
current mode control to regulate both the input and the output
currents. This enables fast transient response (required for
PWM dimming) without the necessity for complex loop
compensation. Input current control enables current limiting
during startup and output overload conditions. Capacitive
isolation protects the LED Lamp from failure of the switching
MOSFET. HV9930 provides a low-frequency PWM dimming
input that can accept an external control signal with a duty ratio
of 0-100%.
The HV9930 based LED driver is ideal for automotive 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
D2
L1
C1
L2
-
VDC
Rd
Cd
VO
Q1
D1
D3
Rcs1
Rcs2
+
Rs1
Rref1
HV9930
V_IN
GATE
V_DD
PWMD
CS1
CS2
GND
REF
Rs2a
C2
Rs2b
Rref2
C3
A090805
· · ^· · ^{Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: [phone] FAX: [phone] www.supertex.com}
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A090805