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| 型號： | APW7095AQDE-TRL |
| 廠商： | ANPEC ELECTRONICS CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PQCC48 |
| 封裝： | 7 X 7 MM, LEAD FREE, MO-220WKKD-4, QFN-48 |
| 文件頁數(shù)： | 15/23頁 |
| 文件大?。?/td> | 430K |
| 代理商： | APW7095AQDE-TRL |
Copyright
ANPEC Electronics Corp.
Rev. A.4 - Dec., 2008
APW 7095/ A
www.anpec.com.tw
15
Function Description
General
The APW7095/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 control, and output
driver. An internal temperature-compensated voltage pro-
vides reference voltages for each channel. An triangular-
wave oscillator(CT) with a timing resistor and capacitor
generates triangular waves to each channel. A inverting
amplifier(CH4) cooperates with the error amplifier for an
inverting converter (with negative output voltage) .
Reference Voltage
The APW7095 outputs a temperature- compensated ref-
erence 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 generates
a triangular oscillation signal (CT) with amplitude of
0.3V~0.8V at CT pin, providing signal to CH6. The oscilla-
tor frequency is settable from 100kHz to 1MHz and set by
a timing resistor and a timing capacitor connected re-
spectively from RT and CT pins to ground. Additional two
triangular oscillation signals (CT1 and CT2) are also in-
ternally 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 outputs 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
APW7095/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
APW7095
APW7095A
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
Timer-Latch Short-Circuit Protection Circuit
The short-circuit protection comparator in each channel
(CH1 to CH5) monitors converter’s output voltage via in-
put pin of error amplifier. In CH6, the short-circuit com-
parator detects the voltage at output of error amplifier. As
any detected voltages of CH1 to CH5 falls below 1.0V or
the detected voltage of CH6 is larger than 0.9V, the timer
circuits is actuated to start charging the external capacitor
CSCP connected from CSCP pin to ground. When the
rising voltage of CSCP reaches 0.7V, the IC turns off all
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