HPW7095 Datasheet, PDF (15/23 Pages) List of Unclassifed Manufacturers – 6-Channel DC/DC Converter Control IC

HPW7095/A
Function Descriptions
General
The HPW7095/A provides voltage-mode feedback con-
trols for six DC/DC PWM converters(CH1 to CH6).
capacitor from the output pin(FB) to inverted input pin
of the error amplifier for stable operations.
Each channel operates with an error amplifier, PWM
comparator, short-circuit comparator, ON/OFF con-
trol and output driver. An internal temperature-com-
pensated voltage provides reference voltages for each
channel. An triangular-wave oscillator(CT) with a tim-
Inverting Amplifier (Inv Amp)
The inverting amplifier detects the inverting DC/DC con-
verter output voltage (as a negative voltage) and out-
puts a control signal to the error amp.
ing resistor and capacitor generates triangular waves
to each channel. A inverting amplifier(CH4) cooper-
ates with the error amplifier for an inverting converter
(with negative output voltage) .
Channel Control Function
The channel control function turns on/off one or more
channels depending on the states (“H” or “L” level) at
CTL, CTL1,2 to CTL5 pins. The on/off control logic is
Reference Voltage
The HPW7095 outputs a temperature- compensated
reference voltage(2.49V) at VREF pin. It is regulated
from the voltage at VCC pin and can source current of
max. 1mA to external loads. It also supplies bias for
the IC’s internal circuitry.
Triangular-wave Oscillator
The triangular-wave oscillator is designed to gener-
ates a triangular oscillation signal (CT) with amplitude
of 0.3V~0.8V at CT pin, providing signal to CH6. The
oscillator frequency is settable from 100kHz to 1MHz
and set by a timing resistor and a timing capacitor
connected respectively from RT and CT pins to ground.
Additional two triangular oscillation signals (CT1 and
shown as the following table:
Channel on/off Setting Table
Vol tage Level at CTL Pin
Channel ON/OFF State
CTL
CTL1,2
CTL3
CTL4
CTL5
Power
/CH6
CH1
/ CH2
CH3
CH4
CH6
L
x
L
H
H
x
x
x
OFF( Standby State)
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
ON
OFF
OFF
OFF
ON
OFF
ON
OFF
ON
ON
OFF
ON
OFF
ON
OFF
ON
ON
OFF
OFF
ON
OFF
ON
OFF
ON
ON
OFF
ON
OFF
ON
OFF
ON
MOSFET Drive Circuits
HPW7095/A uses push-pull configuration at output of
CT2) are also internally generated with amplitude of 1.
1V~1.8V. The CT1 is in phase with the CT to the PWM
comparators of CH2 and CH4; the CT2 is out of phase
with the CT to the PWM comparators of CH1, CH3
and CH5.
Error Amplifier
The error amplifier is designed with unit-gain-bandwidth
of 1MHz and to satisfy wide application requirements.
It works with enternal resistor-capacitor network for
each converter’s feedback compensation. The loop gain
can be set by connecting a feedback resistor and
each MOSFET driver for providing large drive current
to MOSFET gate. The following table shows the
MOSFETs connected to the drivers:
IC
CH1
CH2
CH3
CH4
CH5
CH6
HPW7095
OUT1-1 : PMOS
OUT1-2 : NMOS
OUT2-1 : PMOS
OUT2-2 : NMOS
OUT3 : NMOS
OUT4 : NMOS
OUT5-1 : NMOS
OUT5-2 : PMOS
OUT6 : NMOS
HPW7095A
OUT1-1 : PMOS
OUT1-2 : NMOS
OUT2-1 : NMOS
OUT2-2 : PMOS
OUT3 : NMOS
OUT4 : PMOS
OUT5-1 : NMOS
OUT5-2 : PMOS
OUT6 : NMOS
 Copyright HIPAC Semiconductor, Inc.
15
Rev. A.2 - July., 2004
www.hipacsemi.com