HV9911 Ver la hoja de datos (PDF) - Supertex Inc
Número de pieza
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Fabricante
HV9911 Datasheet PDF : 9 Pages
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HV9911
Pin Assignment
1 VIN
FDBK 16
2 VDD
IREF 15
3 GATE
COMP 14
4 GND
PWMD 13
HV9911
5 CS
OVP 12
6 SC
FAULT 11
7 RT
REF 10
Pin Description
Pin #
1
2
3
4
Pin
VIN
VDD
GATE
GND
5
CS
6
SC
7
RT
8
SYNC
9
CLIM
10
REF
11
FAULT
12
OVP
13
PWMD
14
COMP
15
IREF
16
FDBK
8 SYNC
9 CLIM
Description
This pin is the input of a 9 – 250V high voltage regulator.
This is a power supply pin for all internal circuits. It must be bypassed with a low ESR capacitor to GND
(at least 0.1uF).
This pin is the output gate driver for an external N-channel power MOSFET.
Ground return for all circuits. This pin must be connected to the return path from the input.
This pin is used to sense the drain current of the external power FET. It includes a built-in 100ns (min)
blanking time.
Slope compensation for current sense. A resistor between SC and GND will program the slope
compensation. In case of constant off-time mode of operation, slope compensation is unnecessary and
the pin can be left open.
This pin sets the frequency or the off-time of the power circuit. A resistor between RT and GND will
program the circuit in constant frequency mode. A resistor between RT and GATE will program the circuit
in a constant off-time mode.
This I/O pin may be connected to the SYNC pin of other HV9911 circuits and will cause the oscillators to
lock to the highest frequency oscillator.
This pin provides a programmable input current limit for the converter. The current limit can be set by using
a resistor divider from the REF pin. Soft start can also be provided using this pin.
This pin provides 2% accurate reference voltage. It must be bypassed with at least a 10nF capacitor to
GND
This pin is pulled to ground when there is an output short circuit condition or output over voltage condition.
This pin can be used to drive an external MOSFET in the case of boost converters to disconnect the load
from the source
This pin provides the over voltage protection for the converter. When the voltage at this pin exceeds 1.25V,
the gate output of the HV9912 is turned off and FAULT goes low. The IC will turn on when the power is
recycled
When this pin is pulled to GND (or left open), switching of the HV9911 is disabled. When an external TTL
high level is applied to it, switching will resume
Stable Closed loop control can be accomplished by connecting a compensation network between COMP
and GND
The voltage at this pin sets the output current level. The current reference can be set using a resistor
divider from the REF pin
This pin provides output current feedback to the HV9911 by using a current sense resistor
NR011206
5
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