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參數(shù)資料
| 型號： | HPW7095A |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 6-Channel DC/DC Converter Control IC |
| 中文描述： | 6通道DC / DC變換器控制IC |
| 文件頁數(shù)： | 15/23頁 |
| 文件大?。?/td> | 350K |
| 代理商： | HPW7095A |
Rev. A.2 - J uly., 2004
HPW 7095/ A
15
Copyright
HIPAC Semiconductor, Inc.
www.hipacsemi.com
Function Descriptions
General
The HPW7095/A provides voltage-mode feedback con-
trols for six DC/DC PWM converters(CH1 to CH6).
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-
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) .
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
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
capacitor from the output pin(FB) to inverted input pin
of the error amplifier for stable operations.
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.
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
shown as the following table:
CTL CTL1,2 CTL3 CTL4 CTL5/CH6
OFF(Standby State)
CH3 CH4 CH6
L
x
x
x
H
ON
L
OFF
L
H
OFF
ON
L
OFF
L
H
H
OFF
ON
ON
L
OFF
L
H
OFF
ON
L
OFF
H
H
H
H
ON
ON
ON
ON
Voltage Level at CTL Pin
CTL CTL1,2 CTL3 CTL4 CTL5Power
Channel ON/OFF State
CH1
/CH2
x
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Channel on/off Setting Table
MOSFET Drive Circuits
HPW7095/A uses push-pull configuration at output of
each MOSFET driver for providing large drive current
to MOSFET gate. The following table shows the
MOSFETs connected to the drivers:
IC
HPW7095
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
CH1
OUT1-1 : PMOS
OUT1-2 : NMOS
OUT2-1 : PMOS
OUT2-2 : NMOS
OUT3 : NMOS
OUT4 : NMOS
OUT5-1 : NMOS
OUT5-2 : PMOS
OUT6 : NMOS
CH2
CH3
CH4
CH5
CH6
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