viper31sp STMicroelectronics, viper31sp Datasheet - Page 4

• Manufacturer Part Number: viper31sp
• Description: Battery Charger Primary I.c.
• Manufacturer: STMicroelectronics

VIPer31SP
ELECTRICAL CHARACTERISTICS (T
POWER SECTION
(1) On Inductive Load, Clamped.
SUPPLY SECTION
OSCILLATOR SECTION
(1) The peak and valley voltages are used internally by the voltage mode PWM. The sawtooth generated by the oscillator is compared to
the COMP pin voltage to limit the duty cycle of the power mosfet switch. See block diagram on page 1.
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Symb ol
Symb ol
Symb ol
V
V
R
V
BV
V
V
V
C
I
I
F
F
OSC LO
OSC HI
I
I
I
I
DDhyst
V
DS( on)
CCch
DDreg
DDsc
DDo ff
DSS
CC0
CC1
CC2
DDo n
OSS
SW1
SW2
t
t
DO
DSS
f
r
Drain-Source Voltage
Off-State Drain Current V
Static Drain Source on
Resistance
Fall Time
Rise Time
Output Capacitance
Start-up Charging
Current
Operating Supply
Current
Operating Supply
Current
Operating Supply
Current
Undervoltage
Shutdown
Undervoltage Reset
Hysteresis Start-up
Output Voltage
Drop O ut Voltage
Short Circuit Current
Oscillator Frequency
Initial Accuracy
Oscillator Frequency
Total Variation
Oscillator Peak Voltage (1)
Oscillator Valley
Voltage
Parameter
Parameter
Parameter
I
I
T
T
ID = 0.3 A
(see fig. 1)
I
(see fig. 1)
V
V
(see fig. 2)
F
(see fig. 2)
F
F
(see fig. 2)
(see fig. 2)
(see fig. 2)
(see fig. 2)
V
(see fig. 2)
V
R
T
R
V
(1)
D
D
D
DS
J
J
DS
DD
SW
SW
SW
CC
DD
J
DD
T
T
= 1 mA
= 0.3 A
= 0.3 A
= 25
= 25
= 100
= 8.2 K
= 8.2 K
= 500 V
= 25 V
= 0 to V
= 9 V
= 0 V
= 7 to10 V
J
= 0 KHz
= 100 KHz
= 200 KHz
= 25
o
o
C
C
o
C
Test Cond ition s
Test Cond ition s
Test Cond ition s
o
C, V
DDon
C
C
(see fig.3)
CC
V
V
V
T
T
V
V
COMP
SENSE
COMP
in
= 3300 pF
= 3300 pF
in
= 12 V, unless otherwise specified)
= 300 V (1)
= 300 V (1)
I
V
DD
= 0 V
DS
= 0 V
= 0 V
= T BD mA
= 250 V
Min.
Min.
Min.
TBD
TBD
TBD
TBD
600
Typ .
Typ .
Typ .
TBD
TBD
TBD
TBD
-1.5
250
6.2
2.5
10
50
50
6
8
2
Max.
Max.
Max.
T BD
T BD
T BD
T BD
T BD
6.5
10
1
Un it
Un it
Un it
KHz
KHz
mA
mA
mA
mA
mA
mV
mA
pF
ns
ns
V
V
V
V
V
V
V