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PDF HV9966NG-G Data sheet ( Hoja de datos )
| Número de pieza | HV9966NG-G | |
| Descripción | Boost LED Driver | |
| Fabricantes | Supertex | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de HV9966NG-G (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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Supertex inc.
HV9966
Boost LED Driver with
Low-side LED Wiring Fault Detection
Features
►► Switch mode controller for boost LED driver
►► High output current accuracy
►► Constant frequency operation
►► Hiccup mode protection for both short circuit
and open circuit conditions
►► LED wiring fault detection
Applications
► RGB or white LED backlighting
General Description
The HV9966 is a current mode control LED driver IC designed to control a
boost LED driver in constant frequency mode. The controller uses a peak
current-mode control scheme (with programmable slope compensation)
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 HV9966 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 HV9966 includes LED wiring fault detection function which turns off
the boost converter and sends a shutdown signal to the external power
supply in case the cathode of the LED string (or any tap in the LED string)
is shorted to ground. A dedicated power supply input keeps the wiring fault
detection circuitry armed even in the absence of the VCC supply.
Typical Boost Application Circuit
VBST
CIN
RIN
ZD1
CVIN
L1
Q1 D1
CO
RSC
RCS
ROVP1
R1
ROVP2
R2
12V
CVCC
VIN GT CS
VCC
GND
PWMD
HV9966
FLAG
RT DUTY COMP VDD
OVP
DR
DIS
FB
REF
R3
Q2
RT CC CDDRR1 RR2
RS
Doc.# DSFP-HV9966
A051412
Supertex inc.
www.supertex.com
1 page  
HV9966
Functional Block Diagram
GT DIS VIN DR
VCC
VDD
Regulator
+
-
9.25V/
8.25V
+
3.1V/ -
2.9V
CLK
POR1
SQ
2.76V/2.56V
2.0V
GTB
FLAG
FLAG
POR2
DIM
S
n16 OLD
POR2 R
CLR
4 bit
Counter
S Q EN
n16
n16 R
CLK/4
/4
CLK
Clock
Sync
Monoshot Monoshot
DIM
Q
FLAG
RT
CS
GND
COMP
REF
FB
Blanking
GTB
+
-
RQ
FLT
+
1
+
VDD - 0.3V -
DIM 0.1V +
-
DIM FLT
OL1
DIM
SC
Monoshot
DIM
-
2 min
+
OC
-
DIM POR2
OL1 Monoshot
CLR1
FLT
OL2
RST
OL2
OLD
POR1 Q
R Latch S
DIM
Monoshot
OC
OV
POR1
CLK/4
CLR
8 bit
Counter
RST
n256
EN
CLR1
RST
SQ
Fault
Latch
R
FLT
+
OV - 2.0V/1.8V
PWMD
Note:
Circuit in shaded area is powered off the VIN pin; rest of the circuit is powered off the VDD regulator (powered off VCC for the gate drivers)
OVP
Doc.# DSFP-HV9966
A051412
Supertex inc.
5 www.supertex.com
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet HV9966NG-G.PDF ] | |
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