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參數(shù)資料
| 型號(hào)： | LA5679T |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.03 A SWITCHING CONTROLLER, 320 kHz SWITCHING FREQ-MAX, PDSO36 |
| 封裝： | 0.275 INCH, TSSOP-36 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大小： | 199K |
| 代理商： | LA5679T |
LA5679T
No.7619-12/14
Soft start of Ch2 and Ch3
Ch2 and Ch3 cannot perform soft start when VREF is started in advance because a DTC discharge circuit is not
provided. Provide this discharge circuit.
Plan with an external DTC pin discharge circuit
Resistance between the base and emitter of external PNP transistor (or between
the gate and source in the case of MOS transistor)
During light-load operation, the switching speed of transistor on the sink side of output stage is delayed, so that the
external transistor cannot be turned OFF completely, resulting in increase in the current drain. Insert resistance
between the base and emitter of external PNP transistor (or between the gate and source of MOS transistor) to ensure
switching-off under light load and to prevent increase in the current drain.
To STBY2
27k
To VREF
To DTC2
To STBY3
To VREF
To DTC3
To GND
Q1
Q2
Q3
Q4
51k
27k
51k
100k
100k
Set Q1 and Q3 to the threshold value of 0.89 V while assuming VBE = 0.7V.
OUT
Resistance
VBIAS1
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