L6902D(2002) データシートの表示（PDF） - STMicroelectronics
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L6902D Datasheet PDF : 6 Pages
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INTERNAL BLOCK DIAGRAM
VOLTAGES
MONITOR
INHIBIT
CS+
CS-
Current_E/A
+
-
THERMAL
SHUTDOWN
COMP
VFB 1.235V
Voltage_E/A
+
-E/A
-
PWM
+
OSCILLATOR
3.8V
1.235V
SUPPLY
TRIMMING
PEAK TO PEAK
CURRENT LIMITING
DQ
CK
GND
L6902D
Vcc
VREF
Vref
GOOD
DRIVER
FREQUENCY
SHIFTER
OUT
ELECTRICAL CHARACTERISTCS
(Tj = 25°C, VCC = 12V, unless otherwise specified.) (•) Specification Referred to Tj from 0 to 125°C.
Symbol
Parameter
Test Condition
Min. Typ. Max. Unit
VCC Operating input voltage range VO = 1.235V; IO = 1A
•
8
36
V
Vd Dropout voltage
VCC = 8V; IO = 1A
•
0.25 0.5
V
IO Operating charging current
Rsense = 0.1Ω
0.95
1
1.05
A
• 0.92
1.08
A
Il
Maximum limiting current
VCC = 8V to 36V
•
2
2.5
3.2
A
fs Switching frequency
• 212 250 287 kHz
225 250 275 kHz
d
Duty cycle
0
100
%
DYNAMIC CHARACTERISTICS
V5 Voltage feedback (FB)
8V < VCC < 36V,
20mA < IO < 1A
1.21 1.235 1.259 V
• 1.198 1.235 1.272 V
η
Efficiency
VO = 5V, VCC = 12V
90
%
DC CHARACTERISTICS
Iqop Total operating quiescent
current
•
3
5
mA
Iq
Quiescent current
Duty cycle = 0; VFB = 1.5V
2.7
mA
3/6
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