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參數(shù)資料
| 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)： | 16/23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
16
Timer-Latch Short-Circuit Protection Circuit (Cont.)
Function Description ( Cont.)
external MOSFETs and pulls up the voltage at SWOUT
pin. Then the IC is latched. Applying a signal from “L” to
“H” to CTL pin enables operation again. The short-circuit
detection function remains working during soft-start op-
eration on CH1 to CH5.
Under-Voltage Lockout (UVLO) Circuit
The under-voltage lockout circuit monitors the supply volt-
age at VCC pin to prevent wrong logic control. The IC
starts operation after the supply voltage rises above it’s
rising threshold. As the supply voltage falls below it’s
falling threshold, the IC turns off the external MOSFETs
and pulls up the voltage at SWOUT pin.
The soft-start function controls the output voltage rate of
rise to limit the current surge at start-up. For CH1 to CH5,
the soft-start interval is programmed by the soft-start
capacitor, CS connected from CS pin to ground and
charged by an internal 1
μ
A current source. For CH6, a
soucing current from the internal resistor-divider charges
the capacitor, CCIN6 connected from CIN6 pin to ground,
providing soft-start control.
Figure 1 and 2 show the soft-start processes. In figure 1,
when all control pins (CTL, CTL1,2 to CTL 5) are driven
high (“H” level) at the same time, the voltage at CIN6 pin
starts to rise up by charging the capacitor CCIN6 , starting
a soft-start operation on CH6. After the rising voltage at
CIN6 reaches 0.9V, the reference voltage starts to regu-
late and the internal source current starts to charge the
CS , starting a soft-start operation on CH1 to CH5. During
soft-start interval, the error amplifiers compares the CH1
to CH5 output voltage to the voltage at the CS pin. When
any control pins (CH1,2 to CH5) go “H” from “L” during the
soft-start interval (CH1 to CH5), the output rises rapidly to
follow the rising voltage at CS pin.
Soft-Start Operation
Figure 1 Soft-Start Waveforms
(1)
(3)
t
(2)
(4)
2V
CTL
CTL1,2
CTL3
CTL4
CTL5
Input
VB
Output
CIN6
CH6 Output
Voltage (Vo6)
VREF
CS
CH1 to CH5
Output Voltages
(Vo1 to Vo5)
0.9V
2.49V
1.25V
(1) to (2) : CH6 Soft-Start Interval
(3) : VREF Output start
(3) to (4) : CH1 to CH5 Soft-Start Interval
(1) to (2) : CH6 soft-start interval
(3) : VREF Output start
(4) to (5) : CH1 to CH3 soft-start Interval
(6) to (7) : CH4, CH5 soft-start Interval
(6)' to (7)' : CH4(CH5) soft start interval as CTL4 (CTL5) go
"H" from "L" during CH1 to CH3 soft start interval
(1)
(3)
(2)
(4)
2V
CTL
Input
VB
Output
CIN6
CH6 Output
Voltage (Vo6)
VREF
CS
CH1 to CH3
Output Voltages
(Vo1 to Vo3)
CH4 to CH5
Output Voltages
(Vo4 to Vo5)
0.9V
2.49V
1.25V
CTL1,2
CTL3
CTL4
CTL5
1.25V
t
(5)
(6)
(7)
(6)'
(7)'
Figure 2 Soft-Start Waveforms
Output Switch Control Circuit
The output switch control circuit outputs a signal to con-
trol external p-channel MOSFETs for preventing reactive
current flow to external step-up circuits on CH5 and CH6.
When a “H” level signal is applied to SWIN pin after re-
leasing the UVLO and the voltage at CIN6 pin rises above
0.9V(typical), the IC pulls low the voltage at SWOUT pin,
turning on the external p-channel MOSFETs to generate
output voltages.
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