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L6730 データシート(PDF) 17 Page - STMicroelectronics

部品番号 L6730
部品情報  Adjustable step-down controller with synchronous rectification
PDF  52 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6730 データシート(HTML) 17 Page - STMicroelectronics

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L6730 - L6730B
Device description
Doc ID 11938 Rev 3
17/52
5.5
Error amplifier
5.6
Soft-start
When both VCC and VIN are above their turn-on thresholds (VIN is monitored by the OCH
pin) the start-up phase takes place. Otherwise the SS pin is internally shorted to GND. At
start-up, a ramp is generated charging the external capacitor CSS with an internal current
generator. The initial value for this current is 35 µA and charges the capacitor up to 0.5 V.
After that it becomes 10 µA until the final charge value of approximately 4 V (see Figure 5).
Figure 7.
Error amplifier reference
2.5V
100K
EAREF
VCCDR
0.6V
1.2V
EXT
Error Amplifier Ref.
Figure 8.
Device start-up: voltage at the SS pin
t
t
0.5V
4V
Vcc
Vin
Vss
4.2V
1.25V
4.2V or 8.6V
0.5V
Vcc
Vin
0.5V
1.25V
Vss
4V



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