L6911E Просмотр технического описания (PDF) - STMicroelectronics

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L6911E

5-Bit programmable step down controller with synchronous rectification

STMicroelectronics 

L6911E

Device description

Connecting RT to VCC = 12V or to VCC = 5V the frequency is reduced (current is forced into

the pin), according to the following relationships:

Equation 2

fS

=

200kHz + -4---.-3----0---6-----⋅---1---0----7-

RT(kΩ)

VCC = 12V

Equation 3

fS

=

200kHz + -1---5-----⋅---1---0----7-

RT(kΩ)

VCC = 5V

Note:

Switching frequency variations vs. RT are reported in Figure 3 on page 11.

That forcing a 50µA current into this pin, the device stops switching because no current is

delivered to the oscillator.

Figure 3. Switching frequency variations vs. RT

10000

1000

100

10

10

RT to GND

RT to VCC=12V

RT to VCC=5V

100

Frequency [kHz]

1000

11/34

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