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LT1425CS Datasheet(PDF) 2 Page - Linear Technology

Part # LT1425CS
Description  Isolated Flyback Switching Regulator
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1425CS Datasheet(HTML) 2 Page - Linear Technology

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LT1425
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
TJMAX = 145°C, θJA = 75°C/ W
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND
NC
RFB
VC
RREF
SYNC
SGND
GND
GND
SHDN
ROCOMP
RCCOMP
VIN
VSW
PGND
GND
ORDER PART
NUMBER
LT1425CS
LT1425IS
ELECTRICAL CHARACTERISTICS V
IN = 5V, TJ = 25°C, VSW open, VC = 1.4V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Feedback Amplifier
IREF
Reference Current
Measured at RFB Pin with RREF = 3.000k
402
408
414
µA
q
396
420
µA
IIN
RREF Pin Input Current
500
nA
gm
Feedback Amplifier Transconductance
∆IC = ±10µA (Note 2)
q
400
1000
1600
µmho
ISOURCE, ISINK Feedback Amplifier Source or Sink Current
q
30
50
80
µA
VCL
Feedback Amplifier Clamp Voltage
1.9
V
Reference Voltage/Current Line Regulation
5V
≤ VIN ≤ 18V
q
0.01
0.04
%/V
Voltage Gain
(Note 3)
500
V/V
VIN Sense Error
q
10
25
mV
Output Switch
BV
Output Switch Breakdown Voltage
IC = 5mA
q
35
50
V
V(VSW)
Output Switch ON Voltage
ISW = 1A
q
0.55
0.85
V
ILIM
Switch Current Limit
Duty Cycle = 50%, 0
°C ≤ TJ ≤ 100°C
q
1.35
1.60
1.9
A
Duty Cycle = 50%, – 40
°C ≤ TJ ≤ 100°C
q
1.25
1.60
1.9
A
Duty Cycle = 80%
1.30
A
Current Amplifier
Control Pin Threshold
Duty Cycle = Minimum
0.95
1.2
1.3
V
q
0.85
1.4
V
Control Voltage to Switch Transconductance
2
A/V
Timing
f
Switching Frequency
260
285
300
kHz
q
240
320
kHz
tON
Minimum Switch ON Time
170
210
260
ns
tED
Flyback Enable Delay Time
150
ns
tEN
Minimum Flyback Enable Time
180
ns
Maximum Switch Duty Cycle
q
85
90
95
%
Consult factory for Military grade parts.
(Note 1)
Supply Voltage ........................................................ 20V
Switch Voltage ......................................................... 35V
SHDN, SYNC Pin Voltage ........................................... 7V
RFB Pin Current....................................................... 2mA
Operating Junction Temperature Range
Commercial .......................................... 0
°C to 100°C
Industrial ......................................... – 40
°C to 100°C
Storage Temperature Range ................. – 65
°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300
°C



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