HV9910B Ver la hoja de datos (PDF) - Unspecified
Número de pieza
componentes Descripción
Fabricante
HV9910B Datasheet PDF : 8 Pages
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Block Diagram
HV9910C
VIN
LD
CS
Blanking
-
+
-
+
1.25V
Bandgap
Reference
OTP
RQ
POR
+
250mV -
S
VDD
GATE
Oscillator
GND
RT
PWMD
Pin Description
Pin #
8-Lead SOIC 16-Lead SOIC
Function Description
1
1
VIN This pin is the input of an 15 - 450V linear regulator.
This pin is the current sense pin used to sense the FET current by means
2
4
CS of an external sense resistor. When this pin exceeds the lower of either
the internal 250mV or the voltage at the LD pin, the GATE output goes low.
3
5
GND
Ground return for all internal circuitry. This pin must be electrically con-
nected to the power ground.
4
8
GATE
This pin is the output GATE driver for an external N-channel power
MOSFET.
This is the TTL compatible PWM dimming input of the IC. When this pin is
5
9
PWMD pulled to GND or left open, the GATE driver is turned off. When the pin is
pulled high, the GATE driver operates normally.
6
12
VDD
This is the power supply pin for all internal circuits. It must be bypassed
with a low ESR capacitor to GND (≥0.1μF).
7
13
LD
This pin is the linear dimming input and sets the current sense threshold as
long as the voltage at the pin is less than 250mV (typ).
This pin sets the oscillator frequency. When a resistor is connected be-
8
14
RT
tween RT and GND, the HV9910C operates in constant frequency mode.
When the resistor is connected between RT and GATE, the IC operates in
constant off-time mode.
-
2, 3, 6, 7, 10,
11, 15, 16
NC No connection
Doc.# DSFP-HV9910C
NR041813
Supertex inc.
6
www.supertex.com
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