VIPER22A-E STMicroelectronics, VIPER22A-E Datasheet - Page 7

• Manufacturer Part Number: VIPER22A-E
• Description: Fixed frequency off line converter
• Manufacturer: STMicroelectronics

Specifications of VIPER22A-E

• Constant Current Output: 350 mA, 700 mA, 1.05 A (selectable)
• Input Voltage Range: 90 to 264 VAC 50/60 Hz

VIPer22A-E, VIPer22ADIP-E, VIPer22AS-E
4
4.1
Operations
Rectangular U-I output characteristics
Figure 4.
A complete regulation scheme can achieve combined and accurate output characteristics.
Figure 4.
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.
AC IN
F1
presents a secondary feedback through an optocoupler driven by a TSM101. This
C3
Rectangular U-I output characteristics for battery charger
T2
D4
C4
Doc ID 12050 Rev 2
C5
C10
ISO1
C6
R5
R7
R10
FB
U1
VIPerX2A
VDD
R2
CONTROL
R3
C8
R8
R1
TSM101
U2
C2
D3
SOURCE
-
GND
Vref
+
DRAIN
Vcc
D1
D5
+
-
T1
C7
R4
C9
D2
C1
Operations
R6
R9
DCOUT
GND
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