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參數(shù)資料
| 型號(hào)： | LA5681FN |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 520 kHz SWITCHING FREQ-MAX, QCC48 |
| 封裝： | 7 X 7 MM, VQFN-48 |
| 文件頁(yè)數(shù)： | 10/19頁(yè) |
| 文件大?。?/td> | 308K |
| 代理商： | LA5681FN |
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LA5681FN
No.A0374-18/19
Sample circuit using VBIAS3
Application as shown below is possible because power supply at the output stage is provided by VBIAS3.
VO1 = 3.3V stepped down in CH1 is supplied to VBIAS3. As the voltage of VBIAS3 – 1V is generated at VOUT3, the
MOS transistor can be driven even when the VBTT voltage is low as shown in the sample circuit.
Sample VBIAS3 circuit
*The figure shows the sample VBIAS3 circuit.
Use in the step-down circuit (ch1 to 2)
In the step-down application shown in the figure, VCC lower than the set voltage VO+Vsat is determined to indicate
the short-circuit state, activating SCP.
For VCC < VO+Vsat at step-down
Use in the step-up circuit (ch3 to ch6)
In the step-up application shown in the figure, through-connection is formed via a route of VCC → L → D with STBY
OFF, so that the voltage remains in VO normally.
* In the sample circuit, through-connection with STBY OFF is cut off by MOSFET.
However, the voltage remains in VO when SCP is ON with STBY ON.
To IN3-
V
O
3 = 3.3V
VBIAS3
To IN1-
To OUT1
VBATT=2.5V
OUT3
SW
10
μH
V
O
1 = 3.3V
V
OUT
3
To V
CC
IN+
VF
OUT
V
CC
Vsat (saturation voltage of transistor)
V
O
V
O
V
CC
SCP ON
V
CC
= V
O
+Vsat
V
CC
IN-
D
L
OUT
V
O
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