150KHZ 3A PWM BUCK DC/DC CONVERTER
FSP3123
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
Paramrter
Supply Voltage
Rating
+24
Unit
V
VSD
VFB
VOUT
PD
TST
ON/OFF Pin input Voltage
Feedback Pin Voltage
Output Voltage to Ground
Power Dissipation
Storage Temperature
Operating Temperature
Operating Voltage
-0.3 to +18
-0.3 to +18
-1
V
V
V
W
℃
℃
V
Internally Limited
-65 to +150
-40 to +125
+4.5 to +22
TOP
VOP
ELECTRICAL CHARACTERISTICS (ALL OUTPUT VOLTAGE VERSIONS)
Unless otherwise specified, VIN=12V for 3.3V,5V, adjustable version and VIN=18V for the 12V version. ILOAD=0.5A
Symbol
Paramrter
Conditions
VFB=1.3V(Adjustable
version only)
Min.
Typ.
-10
Max.
-50
-100
173
173
Unit
IB
Feedback bias current
nA
127
110
150
FOSC
FCSP
Oscillator frequency
KHz
kHz
When Current Limit
Occur and
VFB ＜ 0.5V, TA=25°C
Short Circuit Oscillator
Frequency
10
30
50
IOUT=3A
1.4
VSAT
DC
ICL
Saturation voltage
no outside circuit
VFB=0V force driver on
VFB=0V force driver on
VFB=12V force driver off
Peak current
no outside circuit
VFB=0V force driver on
no outside circuit
VFB=12V force driver off
VIN=22V
V
%
A
1.5
Max.Duty Cycle(ON)
Min.Duty Cycle(OFF)
100
0
3.6
3.4
6.9
Current limit
7.5
Output
Output=0
-50
µA
IL
leakage
current
Output=-1
-30
10
200
250
mA
mA
IQ
Quiescent Current
Standby Quiesient
Current
VFB=12V force driver off
ON/OFF Pin=5V
VIN=22V
5
ISTBY
70
µA
VIL
VIH
IH
Low(regultaor ON)
High(regultaor OFF)
0.6
ON/OFF pin logic input
threshold voltage
1.3
V
2.0
ON/OFF pin logic input
current
ON/OFF pin input
current
VLOGIC=2.5V(OFF)
-15
-5
µA
IL
VLOGIC=0.5V(ON)
TO220-5L
TO263-5L
2.5
3.5
Thermal Resistence
Junction
to case
θJC
℃/W
℃/W
PDIP8L
12
28
Thermal Resistence
with Copper Area of
Approximately 3 in2
TO220-5L
Junction
to ambient
θJA
TO263-5L
PDIP8L
23
35
Specifications with boldface type are for full operating temperature range, the other type are for TJ=25ºC.
2007-6-12
2/11
FOSLINK [ FOSLINK SEMICONDUCTOR CO.,LTD ]
