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参数资料
| 型号： | LA5680T |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQFP48 |
| 封装： | 7 X 7 MM, TQFP-48 |
| 文件页数： | 11/20页 |
| 文件大小： | 1293K |
| 代理商： | LA5680T |
LA5680T
No.A0373-19/20
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
Use in the step-down circuit (ch1 to 2)
In the step-down application shown below, 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 below, 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
I
OFF
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