L6732C datasheet(13/32 Pages) STMICROELECTRONICS

tên linh kiện	L6732C

Giải thích chi tiết về linh kiện	Soft-start and inhibit

PDF	32 Pages

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nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

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13 / 32 page

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L6732C

5 Device description

13/32

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 35µA and charges the capacitor up to 0.5V. After that it becomes

10µA until the final charge value of approximately 4V (see Figure 6.). The reference of the error

amplifier is clamped with this voltage (VSS) until it reaches the programmed value. The Device

can always sink current

Figure 5.

Error Amplifier Reference

Figure 6.

Device start-up: Voltage at the SS pin.

VCC

VIN

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L6732C bảng dữ liệu(PDF) 13 Page - STMicroelectronics