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| 型號： | 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)： | 3/14頁 |
| 文件大?。?/td> | 199K |
| 代理商： | LA5679T |
LA5679T
No.7619-11/14
CT1 and CT2
CT1 and CT2 have the waveform mutually displaced by 180 degrees in the phase. Independent frequency setting is
impossible. Set the same value for capacitors to be connected, CT1 and CT2.
Relationship between short-circuit protection and soft start
The soft start condition is judged to be a short-circuit condition and charge to CSCP is continued. Set the soft start time
tSOFT shorter than the set time tSCP for short-circuit protection.
Use in the step-down circuit (ch1)
The step-down application as shown below is judged to be the short-circuit condition withVBIAS1 lower than the set
voltage of VO+VF and SCP is activated.
With VBIAS1
<VO+VF at step-down
Use of the step-up circuit (Ch2, Ch3)
As shown in the figure, the step-up application forms a through via a VCC→L→D route in the STBY OFF mode, so
that the voltage remains in VO. Similarly, the voltage remains in VO in the SCP run mode. If necessary, cut off the
through route with a switch.
When a chopper step-up circuit is used
VBIAS1=VO+VF
VO1
IN+
OUT
VBIAS1
1.8V
VBIAS1
VF
VF (Diode forward voltage)
SCP activated
VCC
OUT
VO
IN-
IOFF
L
D
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