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LT1424-5 Datasheet

Isolated Flyback Switching Regulator with 5V Output

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LT1424-5
Isolated Flyback
Switching Regulator
with 5V Output
FEATURES
s No Transformer “Third Winding” or Optoisolator
Required
s Designed for Use with 1:1 Ratio Transformers
s Fixed, Application Specific 5V Output Voltage
s Regulation Maintained Well into Discontinuous
Mode (Light Load)
s Load Compensation Provides Excellent
Load Regulation
s Available in 8-Pin PDIP and SO Packages
s Operating Frequency: 285kHz
U
APPLICATIO S
s Isolated Communication Supplies
s Industrial Automation
s Instrumentation Systems
DESCRIPTIO
The LT®1424-5 is a monolithic high power switching
regulator specifically designed for the isolated flyback
topology. No “third winding” or optoisolator is required;
the integrated circuit senses the isolated output voltage
directly from the primary side flyback waveform. A high
current, high efficiency switch is included on the die along
with all oscillator, control and protection circuitry.
The LT1424-5 operates with input supply voltages from
3V to 20V and draws only 7mA quiescent current. It can
deliver up to 400mA at 5V with no external power devices.
By utilizing current mode switching techniques, it pro-
vides excellent AC and DC line regulation.
The LT1424-5 has a number of features not found on other
switching regulator ICs. Its unique control circuitry can
maintain regulation well into discontinuous mode. Load
compensation circuitry allows for improved load regula-
tion. An externally activated shutdown mode reduces total
supply current to 20µA typical for standby operation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
5V
+ C1
100µF
10V
INPUT
COM
1000pF
5V Output Isolated Power Supply
0.1µF
18
2 SHDN RCCOMP 7
VC VIN
LT1424-5
36
SYNC
4
VSW 5
SGND PGND
ISOLATION
BARRIER
T1
47
MBRS130LT3
1N5248
47
6
MBR0540T4
330pF
7
34
••
12
+
0.1µF
C1, C2: AVX TPS D107M010R0080
T1: DALE LPE-4841-A307
330pF
5V
400mA
C2
100µF
10V
1.8k
OUT
1424-5 TA01 COM
Load Regulation
5.25
5.00
4.75
0
100 200 300
OUTPUT CURRENT (mA)
400
1424-5 TA02
1


Linear Technology Electronic Components Datasheet

LT1424-5 Datasheet

Isolated Flyback Switching Regulator with 5V Output

No Preview Available !

LT1424-5
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage (VIN) ................................................ 20V
Switch Voltage (VSW) .............................................. 35V
SHDN, SYNC Pin Voltage ........................................... 7V
Operating Junction Temperature Range
Commercial .......................................... 0°C to 125°C
Industrial ......................................... – 40°C to 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
SHDN 1
VC 2
SYNC 3
SGND 4
8 RCCOMP
7 VIN
6 VSW
5 PGND
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
ORDER PART
NUMBER
LT1424CN8-5
LT1424CS8-5
LT1424IN8-5
LT1424IS8-5
S8 PART MARKING
TJMAX = 145°C, θJA = 130°C/ W (N)
TJMAX = 145°C, θJA = 110°C/ W (S)
14245
14245I
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 5V, VSW Open, VC = 1.4V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
Power Supply
VIN(MIN)
ICC
Minimum Operating Voltage
Supply Current
Shutdown Mode Supply Current
q 2.8 3.1
q 7.0 9.5
q 15 40
SHDN Pin Threshold
q 0.3 0.9 1.3
Feedback Amplifier
VREF Reference Voltage
Measured at VSW Pin (Note 2)
5.23 5.30 5.37
q 5.18 5.30 5.42
gm
ISOURCE, ISINK
VCL
Feedback Amplifier Transconductance
Feedback Amplifier Source or Sink Current
Feedback Amplifier Clamp Voltage
Reference Voltage/Current Line Regulation
Voltage Gain
IC = ±10µA (Note 3)
5V VIN 18V
(Note 4)
q 400
q 30
q
1000 1600
50 80
1.9
0.01 0.04
500
Output Switch
BV
V(VSW)
ILIM
Output Switch Breakdown Voltage
Output Switch ON Voltage
Switch Current Limit
IC = 5mA
q 35
50
ISW = 1A
q 0.55 0.85
Duty Cycle = 50%, 0°C TJ 125°C
q 1.35 1.6 1.95
Duty Cycle = 50%, – 40°C TJ 125°C q 1.20 1.6 1.95
Duty Cycle = 80%
1.3
Current Amplifier
Control Pin Threshold
Duty Cycle = Minimum
0.95
q 0.85
1.2
1.2
1.3
1.4
Control Voltage to Switch Transconductance
2
UNITS
V
mA
µA
V
V
V
µmho
µA
V
%/V
V/V
V
V
A
A
A
V
V
A/V
2


Part Number LT1424-5
Description Isolated Flyback Switching Regulator with 5V Output
Maker Linear Technology
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