VIPER100 Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

VIPER100

SMPS PRIMARY I.C.

STMicroelectronics 

Figure 9: Oscillator

Rt

VDD

OSC

Ct

VIPer100/SP - VIPer100A/ASP

For Rt >1.2KΩ

and

Ct ≥ 15nF if FSW ≤ 40KHz

CLK

FSW

=

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

RtCt

⋅





1

–

R-----t-5--–--5--1-0---5---0--

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)

8/23

1

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