VIPER22-LED-EV データシートの表示（PDF） - STMicroelectronics

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VIPER22-LED-EV

Low power OFF-line SMPS primary switcher

STMicroelectronics 

Operations

Figure 6. IFB transfer function

IDpeak

IDlim

VIPer22A-E, VIPer22ADIP-E, VIPer22AS-E

t--O-----N-----m------i--n----⋅---V-----1---I--N---

L

85mA

t--O-----N-----m------i--n----⋅---V-----2---I--N---

L

0

Part masked by the IFBsd

threshold

IFB

IFBsd

It is then possible to build the total DC transfer function between ID and IFB as shown on

Figure 6 on page 10. This figure also takes into account the internal blanking time and its

associated minimum turn on time. This imposes a minimum drain current under which the

device is no more able to control it in a linear way. This drain current depends on the primary

inductance value of the transformer and the input voltage. Two cases may occur, depending

on the value of this current versus the fixed 85 mA value, as described above.

10/21

Doc ID 12050 Rev 2

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