HV300 Ver la hoja de datos (PDF) - Supertex Inc
Número de pieza
componentes Descripción
Fabricante
HV300 Datasheet PDF : 6 Pages
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Functional Block Diagram
VDD
UV
Internal
Supply
Regulator
Band Gap
Reference
VINT
Vref
UVLO
and
POR
Vref
LOGIC
OV
VEE
SENSE
HV300/HV310
HV300:PWRG
HV310: PWRGD
VINT –1.2V
VINT
10µA
VREF
–
Trans-
+ conductor
Buffer
5kΩ
RAMP
GATE
Pinout
PWRGD 1
OV 2
UV 3
VEE 4
8 VDD
7 RAMP
6 GATE
5 SENSE
PWRGD Logic
Model
Condition
HV300
NOT READY
READY
HV310
NOT READY
READY
PWRGD
0
VEE
1
HI Z
1
HI Z
0
VEE
Pin Description
PWRGD – The Power Good Output Pin is held inactive on initial
power application and will go active 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, initiating a new start-up cycle.
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, initializing a new start-up cycle.
VEE – This pin is the negative voltage power supply input to the
circuit.
VDD – 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 signal activating; 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
VEE pin programs the current limit. Constant current output
mode is established when the voltage drop across this resistor
reaches 50mV.
4
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