HV9910B Supertex, HV9910B Datasheet

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HV9910B

Manufacturer Part Number
HV9910B
Description
Universal High Brightness LED Driver
Manufacturer
Supertex
Datasheet

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Features
Applications
Typical Application Circuit
Switch mode controller for single switch LED drivers
Enhanced drop-in replacement to the HV9910
Open loop peak current controller
Internal 8.0 to 450V linear regulator
Constant frequency or constant off-time operation
Linear and PWM dimming capability
Requires few external components for operation
DC/DC or AC/DC LED driver applications
RGB backlighting LED driver
Back lighting of fl at panel displays
General purpose constant current source
Signage and decorative LED lighting
Chargers
C
DD
C
IN
Universal High Brightness
R
PWMD
LD
VDD
T
HV9910B
RT
VIN
GND
GATE
LED Driver
CS
General Description
The HV9910B is an open loop, current mode, control LED
driver IC. The HV9910B can be programmed to operate in
either a constant frequency or constant off-time mode. It
includes an 8.0 - 450V linear regulator which allows it to work
from a wide range of input voltages without the need for an
external low voltage supply. The HV9910B includes a PWM
dimming input that can accept an external control signal with a
duty ratio of 0 - 100% and a frequency of up to a few kilohertz.
It also includes a 0 - 250mV linear dimming input which can
be used for linear dimming of the LED current.
The HV9910B is ideally suited for buck LED drivers. Since
the HV9910B operates in open loop current mode control, the
controller achieves good output current regulation without the
need for any loop compensation. PWM dimming response is
limited only by the rate of rise and fall of the inductor current,
enabling very fast rise and fall times. The HV9910B requires
only three external components (apart from the power stage)
to produce a controlled LED current making it an ideal solution
for low cost LED drivers.
Q1
R
D1
CS
L1
C
O
HV9910B

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HV9910B Summary of contents

Page 1

... LED current. The HV9910B is ideally suited for buck LED drivers. Since the HV9910B operates in open loop current mode control, the controller achieves good output current regulation without the need for any loop compensation. PWM dimming response is limited only by the rate of rise and fall of the inductor current, enabling very fast rise and fall times ...

Page 2

... Line Regulation of V DD, line 1. Also limited by package power dissipation limit, whichever is lower. † V load current external to the HV9910B Denotes the specifi cations which apply over the full operating ambient temperature range of -40°C < Guaranteed by design. Package Options 16-Lead SOIC ...

Page 3

... GATE output fall time FALL 1. Also limited by package power dissipation limit, whichever is lower. † V load current external to the HV9910B Denotes the specifi cations which apply over the full operating ambient temperature range of -40°C < Guaranteed by design. (cont.) (The specifi cations are 25° ...

Page 4

... HV9910B will operate directly off the voltage supplied at the VDD pin. Please note that this external voltage at the VDD pin should not exceed 12V. Although the VIN pin of the HV9910B is rated up to 450V, the actual maximum voltage that can be applied is limited and produces a ramp voltage by the power dissipation in the IC ...

Page 5

... GATE Output The GATE output of the HV9910B is used to drive an ex- ternal FET recommended that the GATE charge of the external FET be less than 25nC for switching frequencies ≤100kHz and less than 15nC for switching frequencies > ...

Page 6

... This pin is the linear dimming input and sets the current sense threshold as LD long as the voltage at the pin is less than 250mV (typ). This pin sets the oscillator frequency. When a resistor is connected be- tween RT and GND, the HV9910B operates in constant frequency mode. RT When the resistor is connected between RT and GATE, the IC operates in constant off-time mode. ...

Page 7

... This dimension is not specifi the original JEDEC drawing. The value listed is for reference only. Drawings are not to scale Top View A Note 1 Seating Plane 0.10 1.25 0.31 4.80 5. 4.90 6.00 0.25 1.65* 0.51 5.00 6.20 7 θ θ L1 View View A 3.80 0.25 0.40 1.27 1.04 3. BSC REF BSC 4.00 0.50 1.27 HV9910B Gauge Plane Seating Plane View B L2 θ θ 0. ...

Page 8

... This dimension is not specifi the original JEDEC drawing. The value listed is for reference only. Drawings are not to scale. (The package drawing(s) in this data sheet may not refl ect the most current specifi cations. For the latest package outline information go to http://www.supertex.com/packaging.html.) Doc.# DSFP-HV9910B A031808 D E1 ...

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