VIPER22A

Manufacturer Part NumberVIPER22A
ManufacturerSTMicroelectronics
VIPER22A datasheet
 
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Page 7/20:

Rectangular U-I Output Characteristics

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VIPer22ADIP/ VIPer22AS - E
4
Operations
4.1

Rectangular U-I Output Characteristics

Figure 3.
Rectangular U-I output characteristics for battery charger
T2
F1
C3
AC IN
A complete regulation scheme can achieve combined and accurate output characteristics.
Figure 3.
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.
4.2
Wide Range of V
The V
pin voltage range extends from 9V to 38V. This feature offers a great flexibility in
DD
design to achieve various behaviors. In
chosen to supply the device with two benefits:
R1
D4
ISO1
U1
C4
VDD
FB
C5
CONTROL
C6
VIPerX2A
R2
R3
R5
C8
C10
R7
R8
R10
Voltage
DD
Figure 3 on page 7
Rev1
Operations
T1
C1
C2
D2
D1
D3
DRAIN
SOURCE
C7
D5
U2
R4
Vcc
Vref
R6
C9
-
+
+
-
GND
R9
TSM101
a forward configuration has been
DCOUT
GND
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