ChipFind - документация

Электронный компонент: FA3635P

Скачать:  PDF   ZIP
FA3635P
1
FA3635P
s
Description
FA3635P is a CMOS IC which includes low on-resistance
power MOSFET for PWM-type switching power supply control.
This IC achieves high efficiency DC-DC converter and it is
suitable for buck converter or inverting converter with high
input voltage of 10V to 50V.
s
Features
Built-in low on-resistance Pch power MOSFET
50V/1.1
(typ.)/1A(peak)
Wide range of 10V to 50V for input voltage
1.2mA low operating current as a Power IC
Latch-mode short-circuit protection function
Built-in over-temperature protection
Tj =125
C (min.)
s
Applications
Power supply for general equipment
s
Dimensions, mm
DIP-8
1
8
5
4
9.4
6.5
7.6
3.4
4.5max
1.5
3.1min
0~15
0~15
0.5
0.1
2.54
0.25
0.25
+0.1
0.05
s
Block diagram
CMOS IC
For Switching Power Supply Control
Pin
Pin
Description
No.
symbol
1
VCC
Power supply
2
FB
Error amplifier output
3
IN
Inverting input to error amplifier
4
GND
Ground
5
GND
Ground
6
REF
Reference voltage
7
CS
Capacitor for soft-start
8
OUT
Output
FA3635P
2
s
Electrical characteristics (Ta=25
C, V
CC
=44V, C
REF
=0.1
F)
Reference voltage section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
terminal Voltage
V
REG
C
REF
=0.1
F
3.00
3.12
3.24
V
Oscillator section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Oscillation frequency
f
OSC
70
81
100
kHz
Frequency change with supply voltage
f
dV
V
CC
=10 to 45V
1
3
%
Frequency change with temperature
f
dT
T
a=20 to +85
C
3
5
%
Error amplifier section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input common mode voltage range
V
ICOM
0.2
2.5
V
Open-loop gain
A
VOL
55
dB
Unity-gain bandwidth
f
T
1.0
MHz
Output sink current
I
FBL
Voltage follower
3.0
3.8
mA
V
FB
=
V
ref
+0.05V
Output source current
I
FBH
Voltage follower
140
100
A
V
FB
=
V
ref
0.05V
Reference Voltage
V
ref
Voltage follower
0.97
1.00
1.03
V
V
CC
=10 to 45V
T
a=20 to +85
C
Input threshold voltage (Pin 2)
V
FB 0
Duty cycle=0%
0.5
0.6
0.7
V
V
FB 100
Duty cycle=100%
2.3
2.5
2.7
V
Undervoltage lockout circuit section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Operating voltage
V
UVLO
5.0
6.1
8.5
V
Soft-start circuit section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Input threshold voltage (Pin 7)
V
CS 0
Duty cycle=0%
0.5
0.6
0.7
V
V
CS 100
Duty cycle=100%
2.3
2.5
2.7
V
Charge current
I
CS
2.8
2.2
1.6
A
s
Recommended operating conditions
Item
Symbol
Min.
Max.
Unit
Supply voltage
V
CC
10.0
45.0
V
REF terminal by-pass capacitor
C
REF
0.047 0.22
F
VCC terminal by-pass capacitor
C
O
470
F
s
Absolute maximum ratings
Item
Symbol
Rating
Unit
V
CC
50.0
V
V
IN
5.5
V
P
d
1.1
W
T
j
125
C
Operating temperature
T
op
20 to +85
C
C
Storage temperature
T
stg
40 to +150
C
Supply voltage
Error amplifier input voltage
Total Power dissipation
(Ta = 25
C)
Junction temperature
FA3635P
3
Output section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Voltage drop
V
DROP
I
OUT
=1.0A
1.1
1.4
V
I
OUT
=0.7A
0.7
0.9
I
OUT
=0.1A
0.1
0.2
Overcurrent limit
I
OLMT
Peak current
1.0
1.75
2.0
A
s
Characteristic curve
Thermal characteristic
Ambient temperature [
C]
L
OSS
[W]
0.2
0.4
0.6
0.8
1.2
1.4
1.6
1
0
0
50
100
150
Overall device
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Operating current
I
CC
Out pin open,
V
CC
=44V
0.9
4.0
mA
Duty cycle=100%
Thermal resistance :
j-c(Junction to case) = 30
C/W
j-a(Junction to air) = 90
C/W
Overheat protection section
Item
Symbol
Test condition
Min.
Typ.
Max.
Unit
Operating temperature
T
OH
125
135
145
C
Hysteresis width
T
OH
45
50
55
C
FA3635P
4
s
Characteristic curves (Ta=25
C)
Output duty cycle vs. FB terminal voltage (V
FB
)
Output duty cycle vs. CS terminal voltage (V
CS
)
0
0.5
1
1.5
2
2.5
3
0
10
20
30
40
50
60
70
80
90
100
V
FB
[V]
Output duty cycle [%]
Oscillation frequency (f
OSC
) vs. ambient temperature (T
a
)
Reference voltage (V
REF
) vs. ambient temperature (T
a
)
Ta [
C]
fosc [kHz]
75
80
85
90
95
100
70
0
20
40
60
80
100
20
Output voltage (V
OUT
) vs. output current (I
OUT
)
Supply current (I
CC
) vs. supply voltage (V
CC
)
I
OUT
[A]
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
0
0
0.2
0.4
0.6
0.8
1
V
CC
V
OUT
[V]
0
0.5
1
1.5
2
2.5
3
0
10
20
30
40
50
60
70
80
90
100
V
CS
[V]
Output duty cycle [%]
V
REF
[V]
0.97
0.98
0.99
1
1.01
1.02
1.03
1.04
1.05
Ta [
C]
0
20
40
60
80
100
20
Vcc [V]
Icc [mA]
0
0.5
1.5
2
1
0
10
20
30
40
50
FA3635P
5
s
Application circuit
Error amplifier voltage gain (A
V
)/ phase (
) vs. frequency (f)
Condition: Open loop
[H
Z
]
[deg]

A
v
[dB]
0
20
40
60
80
100
120
140
160
180
10
100
10K
1K
100K
1M
10M
40
20
Voltage gain
Phase
Parts tolerances characteristics are not defined in the circuit design
sample shown above. When designing an actual circuit for a product,
you must determine parts tolerances and characteristics for safe and
economical operation.