150KHZ 3A PWM BUCK DC/DC CONVERTER
FSP3122
ELECTRICAL CHARACTERISTICS (ALL OUTPUT VOLTAGE VERSIONS)
Unless otherwise specified, V
IN
=12V for 3.3V,5V, adjustable version and V
IN
=24V for the 12V version. I
LOAD
=0.5A
Symbol
Paramrter
Conditions
Min.
Typ.
Max.
Unit
V
FB
=1.3V(Adjustable
50
40
nA
I
B
Feedback bias current
version only)
100
127
150
173
F
OSC
Oscillator frequency
KHz
110
173
I
OUT
=3A
1.16
1.4
V
V
SAT
Saturation voltage
no outside circuit
V
FB
=0V force driver on
Max.Duty Cycle(ON)
V
FB
=0V force driver on
100
%
DC
0
Min.Duty Cycle(OFF)
V
FB
=12V force driver off
Peak current
3.6
6.9
A
I
CL
Current limit
no outside circuit
V
FB
=0V force driver on
no outside circuit
Output
50
µA
Output=0
V
FB
=12V force driver off
I
L
leakage
current
Output=-1
V
IN
=40V
5
30
mA
I
Q
Quiescent Current
V
FB
=12V force driver off
7.8
10
mA
Standby Quiesient
ON/OFF Pin=5V
I
STBY
85
200
µA
Current
V
IN
=40V
V
IL
V
IH
I
H
I
L
θ
JC
ON/OFF pin logic input
threshold voltage
ON/OFF pin logic input
current
ON/OFF pin input
current
Thermal Resistence
Thermal Resistence
With copper area of
approximately 3 in
2
Low(regultaor ON)
High(regultaor OFF)
V
LOGIC
=2.5V(OFF)
V
LOGIC
=0.5V(ON)
TO252-5L
TO220-5L
TO263-5L
TO252-5L
TO220-5L
TO263-5L
Junction
to case
Junction
to ambient
2.0
6
0.02
10
2.5
3.5
30
28
30
15
µA
5
℃
/W
1.4
0.6
V
θ
JA
℃
/W
ELECTRICAL CHARACTERISTICS (CONTINUED)
Symbol
FSP3122-ADJ
V
FB
η
FSP3122-3.3V
V
OUT
η
FSP3122-5V
V
OUT
η
FSP3122-12V
V
OUT
Parameter
Output Feedback
Efficiency
Output voltage
Efficiency
Output voltage
Efficiency
Output voltage
Conditions
4.5V≤V
IN
≤40V
0.2A≤I
LOAD
≤3A
V
OUT
programmed for
3V
V
IN
=12V, I
LOAD
=3A
5V≤V
IN
≤40V
0.2A≤I
LOAD
≤3A
V
IN
=12V,
I
LOAD
=3A
7V≤V
IN
≤40V
0.2A≤I
LOAD
≤3A
V
IN
=12V,
I
LOAD
=3A
15V≤V
IN
≤40V
0.2A≤I
LOAD
≤3A
Typ.
1.23
72
3.3
72
5
79
12
11.52/11.4
12.48/12.6
4.8/4.75
5.2/5.25
3.168/3.135
3.432/3.465
Limit
1.193/1.18
1.267/1.28
Unit
V
V
MIN
V
MAX
%
V
V
MIN
V
MAX
%
V
V
MIN
V
MAX
%
V
V
MIN
V
MAX
%
90
η
Efficiency
V
IN
=15V, I
LOAD
=3A
Specifications with
boldface type
are for full operating temperature range, the other type are for TJ=25
º
C.
3/10
2007-6-12
FOSLINK [ FOSLINK SEMICONDUCTOR CO.,LTD ]
