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LT1424IS8-5#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LT1424-5
sn14245 14245fs
Isolated Flyback
Switching Regulator
with 5V Output
■
No Transformer “Third Winding” or Optoisolator
Required
■
Designed for Use with 1:1 Ratio Transformers
■
Fixed, Application Specific 5V Output Voltage
■
Regulation Maintained Well into Discontinuous
Mode (Light Load)
■
Load Compensation Provides Excellent
Load Regulation
■
Available in 8-Pin PDIP and SO Packages
■
Operating Frequency: 285kHz
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.
■
Isolated Communication Supplies
■
Industrial Automation
■
Instrumentation Systems
5V Output Isolated Power Supply
+
SHDN
V
C
LT1424-5
SYNC
SGND
8
1N5248
6
ISOLATION
BARRIER
T1
MBRS130LT3
7
3
1
•
•
47Ω
47Ω
1424-5 TA01
1.8k
MBR0540T4
7
6
5
0.1µF
C1, C2: AVX TPS D107M010R0080
T1: DALE LPE-4841-A307
330pF
330pF
0.1µF
C1
100µF
10V
1000pF
1
5V
INPUT
COM
2
3
4
R
CCOMP
V
IN
V
SW
PGND
4
2
•
+
C2
100µF
10V
5V
400mA
OUT
COM
OUTPUT CURRENT (mA)
0
OUTPUT VOLTAGE (V)
4.75
5.00
5.25
100 200
1424-5 TA02
300 400
Load Regulation
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LT1424-5
sn14245 14245fs
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
Consult factory for Military grade parts.
T
JMAX
= 145°C, θ
JA
= 130°C/ W (N)
T
JMAX
= 145°C, θ
JA
= 110°C/ W (S)
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
N8 PACKAGE
8-LEAD PDIP
SHDN
V
C
SYNC
SGND
R
CCOMP
V
IN
V
SW
PGND
14245
1424I5
ORDER PART
NUMBER
LT1424CN8-5
LT1424CS8-5
LT1424IN8-5
LT1424IS8-5
S8 PART MARKING
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply
V
IN(MIN)
Minimum Operating Voltage ● 2.8 3.1 V
I
CC
Supply Current ● 7.0 9.5 mA
Shutdown Mode Supply Current ● 15 40 µA
SHDN Pin Threshold ● 0.3 0.9 1.3 V
Feedback Amplifier
V
REF
Reference Voltage Measured at V
SW
Pin (Note 2) 5.23 5.30 5.37 V
● 5.18 5.30 5.42 V
g
m
Feedback Amplifier Transconductance ∆I
C
= ±10µA (Note 3) ● 400 1000 1600 µmho
I
SOURCE
, I
SINK
Feedback Amplifier Source or Sink Current ● 30 50 80 µA
V
CL
Feedback Amplifier Clamp Voltage 1.9 V
Reference Voltage/Current Line Regulation 5V ≤ V
IN
≤ 18V ● 0.01 0.04 %/V
Voltage Gain (Note 4) 500 V/V
Output Switch
BV Output Switch Breakdown Voltage I
C
= 5mA ● 35 50 V
V(V
SW
) Output Switch ON Voltage I
SW
= 1A ● 0.55 0.85 V
I
LIM
Switch Current Limit Duty Cycle = 50%, 0°C ≤ T
J
≤ 125°C ● 1.35 1.6 1.95 A
Duty Cycle = 50%, –40°C ≤ T
J
≤ 125°C ● 1.20 1.6 1.95 A
Duty Cycle = 80% 1.3 A
Current Amplifier
Control Pin Threshold Duty Cycle = Minimum 0.95 1.2 1.3 V
● 0.85 1.2 1.4 V
Control Voltage to Switch Transconductance 2 A/V
(Note 1)
Supply Voltage (V
IN
)................................................ 20V
Switch Voltage (V
SW
) .............................................. 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
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
SW
Open, V
C
= 1.4V, unless otherwise specified.
3
LT1424-5
sn14245 14245fs
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Timing
f Switching Frequency 260 285 300 kHz
● 240 285 320 kHz
t
ON
Minimum Switch ON Time 170 200 260 ns
t
ED
Flyback Enable Delay Time 150 ns
t
EN
Minimum Flyback Enable Time 180 ns
Maximum Switch Duty Cycle ● 85 90 %
Load Compensation
∆V
REF
/∆I
SW
0.9 Ω
SYNC Function
Minimum SYNC Amplitude ● 1.5 2.2 V
Synchronization Range ● 330 450 kHz
SYNC Pin Input Resistance 40 kΩ
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be imparied.
Note 2: V
REF
is a parameter which is measured at the V
SW
pin. It differs
from the output voltage because it accounts for output diode drop,
transformer leakage inductance, etc. Nominal output voltage is 5V in the
intended application circuit.
Note 3: Feedback amplifier transconductance is R
REF
referred.
Note 4: Voltage gain is R
REF
referred.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
SW
Open, V
C
= 1.4V, unless otherwise specified.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT1424IS8-5#TRPBF

Mfr. #:
Buy LT1424IS8-5#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Iso Fly Sw Reg w/ 5V Out
Lifecycle:
New from this manufacturer.
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