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参数资料
| 型号： | APW7066QAC-TRL |
| 厂商： | ANPEC ELECTRONICS CORP |
| 元件分类： | 稳压器 |
| 英文描述： | Dual Synchronous Buck PWM Controllers and One Linear Controller |
| 中文描述： | SWITCHING CONTROLLER, QCC32 |
| 封装： | 5 X 5 MM, LEAD FREE, QFN-32 |
| 文件页数： | 14/33页 |
| 文件大小： | 338K |
| 代理商： | APW7066QAC-TRL |
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Copyright
ANPEC Electronics Corp.
Rev. A.7 - Mar., 2008
APW7066
21
Function Description (Cont.)
Soft-Start/Enable
The three SS/EN pins control the soft-start and enable
or disable the controller. In Independent mode, the
three regulators all have independent soft-start and
enable functions. Connect a soft-start capacitor from
each SS/EN pin to the GND to set the soft-start
interval, and an open drain logic signal for each SS/EN
pin will enable or disable the respective output.
Figure 4. Shows the soft-start interval. When both VCC
and VCC12 reach their Power-On-Reset threshold
4.23V and 7.8V, a 30uA current source starts to
charge the capacitor. When the SS reaches the
enabled threshold about 1V, the internal 0.6V
reference starts to rise and follows the SS; the error
amplifier output (COMP) suddenly raises to 1.1V, which
is the valley of the oscillator
’s triangle wave, leads the
VOUT to start up. Until the SS reaches about 3.0V,
the internal reference completes the soft-start interval
and reaches to 0.6V; then VOUT1 is in regulation. The
SS1 still rises to 3.5V and then stops.
Figure 4. Soft-Start Interval
TIME
VOLTAGE
t1
t2
t0
VSS
VOUT
3V
1V
2V
I
C
t
T
SS
1
2
Start
-
Soft
=
=
PGOOD
The PGOOD output is an open-drain device, when the
VCC is present; the gate of open-drain device will be
high, forcing the PGOOD pin to go low. The three
SS/EN pins and the SCP signals control the PGOOD
signal (see block diagram), after the three SS/EN
signals are over threshold high 3.3V and three outputs
have no short-circuit, the PGOOD goes high to
indicate all regulators are ready. If any of the SS/EN
pins goes below threshold low 3.2V, the PGOOD will
go low. Also, if any of the outputs has a short, the
PGOOD pull low and if short-circuit condition
continues for 1-2 clock pulses, all regulators will shut
down. If the short-circuit is not long enough to shut
down, it may still cause PGOOD to go low momentarily.
Because the PGOOD is an open-drain device, the
typical range of the value to connect a pull high
resistor to VCC will be 1k
to 10k; if PGOOD is not
used, leave it open.
Shunt Regulator
The APW7066 must have two power supplies VCC
(5V) and VCC12 (12V) to drive the IC; VCC (5V) is for
the control circuit and VCC12 (12V) is for the drivers
of outputs. But it can also operate only VCC12,
because the shunt regulator 5.8V was designed for
VCC (5V); the range of the shunt regulator was de-
signed over the usual range 4.5V to 5.5V of typical 5V
power supplies.
Connect a resistor from VCC12 to VCC for shunt
regulator and for the supply current. The input supply
current of VCC is 7mA; minimum shunt regulator
current is about 7mA, and therefore the 20mA shunt
regulator current is enough; thus, the typical value,
300 Ω of the resistor is recommended. The relation
among minimun shunt regulator current, required shunt
regulator current and supply current is:
Where:
CSS = external Soft-Start capacitor
ISS = Soft-Start current = 30
A
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| APW7066QAC-TU | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Dual Synchronous Buck PWM Controllers and One Linear Controller |
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| APW7066RC-TRG | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Dual Synchronous Buck PWM Controllers and One Linear Controller |
| APW7066RC-TRL | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Dual Synchronous Buck PWM Controllers and One Linear Controller |
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