HV300
_______________________________________________________________________________________
Pinout
PWRGD
1
8
VDD
OV
2
HV300
7
RAMP
UV
3
6
GATE
VEE
4
5
SENSE
Pin Description
PWRGD –
The Power Good Output Pin is held Low on initial power
application and will release its high voltage (V
EE
+ 90V) open drain
when the external MOSFET is fully turned on. This pin may be
used as an enable control when connected directly to a PWM
power module.
OV –
This Over Voltage sense pin, when raised above its high
threshold will immediately cause the GATE pin to be pulled low.
The GATE pin will remain low until the voltage on this pin falls
below the low threshold limit and a new start-up cycle will engage.
UV
– This Under Voltage sense pin, when below its low threshold
limit will ensure that the GATE pin is low. The GATE pin will remain
low until the voltage on this pin rises above the high threshold and a
new start-up cycle wil engage.
V
EE
– This pin is the negative voltage power supply input to the
circuit.
V
DD
–
This pin is the positive voltage power supply input to the
circuit.
RAMP –
This pin provides a current output so that a timing ramp
voltage is generated when a capacitor is connected. The initial
portion of the ramp provides a time delay, which in conjunction with
the Under Voltage detection circuit eliminates circuit card insertion
contact bounce. The RAMP pin also controls the delay between the
current limit mode disengaging and the PWRGD high voltage open
drain pull down releasing; as well as the current rise profile after the
initial turn on delay.
GATE –
This is the Gate Driver Output for the external N-Channel
MOSFET.
SENSE –
The current sense resistor connected from this pin to
V
EE
Pin programs the current limit. Constant current output mode is
established when the voltage drop across this resistor reaches
50mV.
Package Dimensions
Prepared by the Telecom Group
3 of 5
Rev. E
7/19/2001
_________________________________________________________________ ______________________________________________
Supertex, Inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
SUPERTEX [ Supertex, Inc ]
