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參數(shù)資料
| 型號(hào)： | AN8018SA |
| 廠商： | PANASONIC CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.8-volt 2-channel step-up, step-down, or inverting DC-DC converter control IC |
| 中文描述： | 0.05 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.225 INCH, 0.65 MM PITCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 18/26頁 |
| 文件大?。?/td> | 268K |
| 代理商： | AN8018SA |
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18
AN8018SA
Voltage Regulators
I
Application Notes (continued)
[7] Parallel synchronous operation of multiple ICs (continued)
2. About the operation of short-circuit protection at parallel synchronous operation
In the case of the operation in parallel, if the single output (or multiple outputs) of them is short-circuited and
the timer latch short circuit protection of the IC is operated, the output of other ICs will be also shut down, then
enter into latch mode.
In figure 8, if the IC-2 entered timer latch mode, Q1 turns on and the OSC terminal (pin 1) is fixed to
approximately 1.1 V and the oscillator stops.
Then channel 1 of IC-1 becomes low level than the DT1 terminal (pin 6) voltage or high-level voltage (0.9 V)
of the FB1 terminal set by terminal voltage, and then output 2 stops by PWM1 circuit of inside. The channel 2 stops
output 2 by oscillator high-level detection comparator.
And then, the IC-1 becomes short-circuit state and enters latch mode after a certain time.
It becomes the same operation in case of the IC-1 enters latch mode previously.
S.C.P.
IC-2 side
output short-circuited
1.19 V
DT1
FB1
Out1
OSC
Since the OSC terminal voltage
becomes higher than
the DT1 terminal voltage,
the Out1 becomes fully off state.
FB2
DT2
Out2
OSC
S.C.P.
1.19 V
Oscillator high-level
detection comparator
V
OSC
=
V
REF
V
CE(sat)
=
becomes approximately 1.1 V
Forced to be in off state
inside the IC
IC-1 latch
IC-2 latch
1
0.9 V
IC-1
1
1
IC-2
Q1
1
Channel 2 goes off
at high
The IC entering to the lach mode,
Q1 turns on and,
Figure 8. Operation of short-circuit protection at parallel synchronous operation
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