VIPER50-E Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

VIPER50-E

SMPS PRIMARY I.C.

STMicroelectronics 

5 Operation Description

Figure 14. Oscillator

Rt

VDD

OSC

Ct

VIPer50-E

For Rt > 1.2kΩ and Ct ≤ 40KHz

CLK

FSW

=

---2---.-3---

RtCt

⋅

⎛

⎝

1

–

-R----t-5--–-5---10---5---0- ⎠⎞

18/29

FC00050

Ct

22nF

15nF

Forbidden area

880

Ct(nF) =

Fsw(kHz)

Forbidden area

40kHz

Fsw

1,000

Oscillator frequency vs Rt and Ct

FC00030

Ct = 1.5 nF

500

300

Ct = 2.7 nF

Ct = 4.7 nF

200

Ct = 10 nF

100

50

30

1

23

5

10

20 30 50

Rt (kΩ)

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