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PDF HV9860 Data sheet ( Hoja de datos )
| Número de pieza | HV9860 | |
| Descripción | Single Channel Boost LED Driver | |
| Fabricantes | Supertex | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HV9860 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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www.DataSheet.co.kr
Supertex inc.
HV9860
Single Channel Boost LED Driver
with LED Wiring Fault Detection
Features
►► Switch mode controller for boost and flyback
converters
►► Discontinuous conduction mode of operation
►► High output current accuracy
►► Internal ±2% voltage reference (0OC <TA < 85OC)
►► Internally fixed 100kHz switching frequency
►► Hiccup mode protection for both short circuit and
open circuit conditions
►► LED wiring fault detection to detect short cathode
to ground condition
Applications
►► DC/DC LED driver applications
►► RGB or white LED backlight applications
►► Flat panel display backlighting
Typical Application Circuit
VIN
CIN
RL1
General Description
The HV9860 is a current mode control LED driver IC designed
to control a boost or flyback LED driver in constant frequency
mode. The controller uses a peak current-mode control scheme
and includes an internal transconductance amplifier to accurately
control the output current over all line and load conditions. The IC
also provides a disconnect switch gate drive output, which can be
used to achieve good PWM rise and fall times for the LED current
using an external disconnect FET.
The HV9860 also has a DUTY pin which can be used to set the
maximum duty cycle to either 90%(typ) or 75%(typ). The 75%
duty cycle limit can be used for flyback applications.
The HV9860 also provides a TTL compatible, low-frequency 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.
The HV9860 includes a wiring fault detection function that sends
a flag to the boost input power supply in case of an LED to wiring
fault.
L1
Q1 RO1
CO
RL2
RCS
RO2
12V
CDD
3.3V/5.0V
VCC
LINE GATE CS
OVP DUTY
VDD
PWMI
GND
FLAG
HV9860
REF
FBP
PWMO
FBN
COMP
RPULL-UP
RR1
CR
RR2 CC
Q2
RS
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
www.DataSheet.co.kr
HV9860
Power-On Sequence
For the IC to work as intended, the following power-on sequence is critical.
1. VCC to the IC
2. 3.3 or 5.0V to the pull-up resistor at FLAG
3. VIN for the boost or flyback converter
Note that 1 and 2 can be interchanged but item 3 should always occur after items 1 and 2.
Functional Block Diagram
VDD
GATE PWMO
VCC
REF
DUTY
CS
10V
Regulator
10V
Regulator
8.5/8.0V
100 KHz
Oscillator
SYNC
4.5/4.0V
CLK
DIM
TBLANK
POR
SQ
DIM
DIM
RQ
LINE
2.0V/ 1.8V
GND
REF
COMP
FLT
REF
-0.3V
0.1V
FC
POR
DIM
LOP
UVLO
Fault Logic
ovoc
FLAG
FLAG
PWMI
DIM
500ns
2
BLNK
FBP
FBN
BLNK
min
2.0V/1.8V
OVP
Supertex inc. ● 1235 Bordeaux Drive, Sunnyvale, CA 94089 ● Tel: 408-222-8888 ● www.supertex.com
5
Datasheet pdf - http://www.DataSheet4U.net/
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet HV9860.PDF ] | |
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