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LT1424-9 Datasheet

Isolated Flyback Switching Regulator with 9V Output

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LT1424-9
Isolated Flyback
Switching Regulator
with 9V Output
FEATURES
s No Transformer “Third Winding” or Optoisolator
Required
s Application Circuit Meets PCMCIA Type II
Height Requirement
s Fixed, Application Specific 9V 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 Ethernet Isolated 5V to – 9V Converter
DESCRIPTIO
The LT®1424-9 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 LT1424-9 operates with input supply voltages from
3V to 20V and draws only 7mA quiescent current. It can
deliver up to 200mA at 9V with no external power devices.
By utilizing current mode switching techniques, it pro-
vides excellent AC and DC line regulation.
The LT1424-9 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
INPUT
COM
– 9V PCMCIA Type II Isolated LAN Supply
(2.41mm Maximum Component Height)
C1
10µF
25V
C2
10µF
25V
100k
1000pF
0.1µF
47pF
LT1424-9
2
VC
1
SHDN
3 SYNC
4 SGND
8
RCCOMP
7
VIN
6
VSW
5
PGND
ISOLATION
BARRIER
C6
R2 220pF
75
D1 R1 MBRS130LT3
1N5248
75
OUT
COM
C5
220pF
13
C3 C4 1.8k
D2
MBR0540T4
T1
10µF
10µF
25V 25V
24
– 9V
200mA
1:1 1424 TA01
0.1µF
C1, C2, C3, C4: MARCON THCS50E1E106Z CERAMIC
CAPACITOR, SIZE 1812. (847) 696-2000
T1: COILTRONICS CTX02-13483
1


Linear Technology Electronic Components Datasheet

LT1424-9 Datasheet

Isolated Flyback Switching Regulator with 9V Output

No Preview Available !

LT1424-9
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage ........................................................ 20V
Switch Voltage ......................................................... 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
ORDER PART
NUMBER
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
TJMAX = 145°C, θJA = 130°C/ W (N)
TJMAX = 145°C, θJA = 110°C/ W (S)
LT1424CN8-9
LT1424CS8-9
LT1424IN8-9
LT1424IS8-9
S8 PART MARKING
14249
14249I
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 Input Voltage
Supply Current
Shutdown Mode Supply Current
q 2.8 3.1
q 7.0 9.5
q 15 40
Shutdown Mode Threshold
q 0.3 0.9 1.3
Feedback Amplifier
VREF Reference Voltage
Measured at VSW Pin (Note 2)
9.00 9.15 9.30
q 8.90 9.15 9.40
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 2)
5V VIN 18V
(Note 3)
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 LT1424-9
Description Isolated Flyback Switching Regulator with 9V Output
Maker Linear Technology
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LT1424-9 Datasheet PDF





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