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 

VIPer22A-E, VIPer22ADIP-E, VIPer22AS-E

4

Operations

Operations

4.1

Rectangular U-I output characteristics

Figure 4. Rectangular U-I output characteristics for battery charger

F1

AC IN

T2

C3

D4

C4

C5

ISO1

C6

R1

C2

D1

D3

U1

FB

VDD

CONTROL

VIPerX2A

DRAIN

SOURCE

T1

C1

D2

C7

R2

D5

DCOUT

U2

R3

Vcc

R4

Vref

R5

C8

C9

C10

-

+

+

-

GND

R7

R8 TSM101

R10

R6

R9

GND

A complete regulation scheme can achieve combined and accurate output characteristics.

Figure 4. presents a secondary feedback through an optocoupler driven by a TSM101. This

device offers two operational amplifiers and a voltage reference, thus allowing the regulation

of both output voltage and current. An integrated OR function performs the combination of

the two resulting error signals, leading to a dual voltage and current limitation, known as a

rectangular output characteristic. This type of power supply is especially useful for battery

chargers where the output is mainly used in current mode, in order to deliver a defined

charging rate. The accurate voltage regulation is also convenient for Li-ion batteries which

require both modes of operation.

Doc ID 12050 Rev 2

7/21

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