AN2713 datasheet(18/40 Pages) STMICROELECTRONICS

поискавой системы для электроныых деталей

AN2713 датащи(PDF) 18 Page - STMicroelectronics

номер детали	AN2713

подробное описание детали	LNB power supply based on the LNBH23 supply

PDF	40 Pages

Scroll/Zoom	100%

производитель	STMICROELECTRONICS [STMicroelectronics]

домашняя страница	http://www.st.com

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AN2713

18/40

Doc ID 14431 Rev 1

The following steps must be taken to ensure the correct implementation of 18 to 13 V

transition with the VoTx addition circuit shown in Figure 6:

●

T0: to start the 18 V to 13 V transition the TTX function must be activated at least

0.5 ms before setting the VSEL I2C bit (set HIGH TTX I2C bit or TTX pin).

●

T1: set LOW VSEL I2C bit.

●

T2: after 30 ms, 18 V to 13 V LNB transition time is elapsed at T2. The 30 ms delay is

valid to ensure 18 V to 13 V complete transition in case of Cbus=100 µF and

Iout=0 mA. The delay time can be modified with different Cbus capacitance and output

current value.

Figure 7.

Fast transition timing sequence

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