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HV7100NG-GM903 Datasheet(PDF) 4 Page - Supertex, Inc

Part No. HV7100NG-GM903
Description  24/48V Fan Driver/Controller With High-Side Drive
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Maker  SUTEX [Supertex, Inc]
Homepage  http://www.supertex.com
Logo SUTEX - Supertex, Inc

HV7100NG-GM903 Datasheet(HTML) 4 Page - Supertex, Inc

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Doc.# DSFP-HV7100
B072413
HV7100
Reg
V
PP
EN
UVLO
GND
DAC
Reg
3.3V
V
DD
VGATE
LIN
CT
RT
OUT
DIN0-3
powered by
V
DD - GND
VPP1
VPP2
Ramp
Gen
powered by
V
PP - VGATE
Level
Translator
Ideal
Diodes
Functional Block Diagram
Functional Description
The HV7100 requires a single +16 to +75V supply to bias its
internal circuitry. It internally generates 3.3V for V
DD, and -12V
relative to V
PP for driving the external P-channel MOSFET. If
an external V
DD is applied (greater than 3.6V but less than
5.5V), the internal regulator will shut off. The HV7100 drives
an external P-channel FET to drive the 24V/48V DC fan.
An external diode, connected across the fan terminals, is
required to clamp the voltage across the fan to a diode drop
during the off period.
Pulse Width Modulator
The PWM circuit compares the internal triangle wave
oscillator (0.5 – 2.5V pk-pk) with the linear control voltage
or the DAC output. Its output is a square-wave PWM signal
with duty cycle ranging from 0% to 100%.
When an external PWM signal is applied to the Enable input
and the internal PWM generator is not needed, R
T and LIN
should be connected to V
DD and CT connected to GND.
Oscillator
A capacitor connected between the C
T and GND sets the
frequency of the internal triangular frequency oscillator in
conjunction with the timing resistor R
T. RT sets the charge/
discharge current into and out of C
T.
The frequency is determined by the following equation:
f =
(0.258)
(R
T x CT)
P-Channel Gate Driver
The PWM output of the comparator circuit is level translated
and is the input to the gate drive circuit. The gate drive circuit
turns an external P-channel FET on and off by applying -12V
and 0V (reference to V
PP), respectively, between its gate and
source. The -12V supply to the gate drive circuit is generated
internally from V
PP.
Enable
The EN pin directly controls the gate drive circuit. Pulling
this pin to logic ground applies 0V to the external P-channel
gate to turn it off. Applying a logic HIGH signal or pulling
the voltage to V
DD resumes the switching cycle of the PWM
signal.
Speed Control
The fan speed can be controlled in three ways:
Linear Control - Applying a DC voltage between 0.5V to
2.5V to the LIN pin varies the duty cycle of the voltage driving
the fans from 0% to 100% according to:
D =
V
LIN - 0.25
2
Linear control voltage below 0.5V will turn off the fan
completely (0% duty cycle), while voltage greater than 2.5V
will fully turn the fan on (100% duty cycle).


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