HV9930
HV9930
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
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%.
Applications
Automotive LED Drivers
RGB backlight applications
Battery Powered LED Lamps
Other Low Voltage AC/DC or DC/DC LED Drivers
Typical Application Circuit
D2
L1
C1
L2
-
VDC
Rcs1
Rd
Cd
Q1
D1
Rcs2
D3
VO
+
Rs1
HV9930
V
IN
GATE
CS1
Rref1
GND
V
DD
PWMD
CS2
REF
Rs2a
C2
Rs2b
Rref2
C3
A090805
Supertex inc.
·
1235 Bordeaux Drive, Sunnyvale, CA 94089
·
Tel: (408) 222-8888
·
FAX: (408) 222-4895
·
www.supertex.com
A090805
1
SUPERTEX [ Supertex, Inc ]
