VIPER53-E datasheet(27/36 Pages) STMICROELECTRONICS

Part #	VIPER53-E

Description	OFF-line primary switch

PDF	36 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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27 / 36 page

VIPer53 - E

Transconductance error amplifier

27/36

The lowest load gives another condition for stability: The frequency FBW1 must not encounter

the second order slope generated by the load pole and the integrator part of the error

amplifier. This condition can be met by adjusting the CCOMP value:

Equation 13

The above formula gives a minimum value for CCOMP. It can be then increased to provide a

natural soft start function as this capacitor is charged by the error amplifier current capacity

ICOMPhi at start-up.

Figure 22. Typical compensation network

COMP

OUT

⋅

6.3

COMP

⋅⋅

------------------------------------------------------

OUT1

MAX

-------------------

⋅

OUT1

OUT

---------------

With:

15V

VDD

OSC

DRAIN

SOURCE

COMP

TOVL

Rcomp

Ccomp

10nF

VIPER53-E Datasheet(PDF) 27 Page - STMicroelectronics