L6725ATR datasheet(12/32 Pages) STMICROELECTRONICS

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L6725ATR Arkusz danych(PDF) 12 Page - STMicroelectronics

Numer części	L6725ATR

Szczegółowy opis	Voltage mode PWM controller with bootstrap anti-discharging system

PDF	32 Pages

Scroll/Zoom	100%

Producent	STMICROELECTRONICS [STMicroelectronics]

Strona internetowa	http://www.st.com

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12 / 32 page

Device description

L6725 - L6725A

12/32

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 5.).

Figure 4.

Error amplifier reference

Figure 5.

Soft-Start phase.

0.5V

Vcc

Vin

Vss

4.2V

1.25V

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