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LTC1702A Datasheet

  • LTC1702A

  • High Voltage, Current Mode Switching Regulator Controller

  • 24頁

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LT3724
High Voltage, Current Mode
Switching Regulator Controller
FEATURES
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DESCRIPTIO
Wide Input Range: 4V to 60V
Output Voltages up to 36V (Step-Down)
Burst Mode
廬
Operation: <100碌A(chǔ) Supply Current
<10碌A(chǔ) Shutdown Supply Current
鹵1.3%
Reference Accuracy
200kHz Fixed Frequency
Drives N-Channel MOSFET
Programmable Soft-Start
Programmable Undervoltage Lockout
Internal High Voltage Regulator for Gate Drive
Thermal Shutdown
Current Limit Unaffected by Duty Cycle
16-Pin Thermally Enhanced TSSOP Package
The LT
廬
3724 is a DC/DC controller used for medium
power, low part count, low cost, high efficiency supplies.
It offers a wide 4V-60V input range (7.5V minimum startup
voltage) and can implement step-down, step-up, inverting
and SEPIC topologies.
The LT3724 includes Burst Mode operation, which re-
duces quiescent current below 100碌A(chǔ) and maintains high
efficiency at light loads. An internal high voltage bias
regulator allows for simple biasing and can be back driven
to increase efficiency.
Additional features include fixed frequency current mode
control for fast line and load transient response; a gate
driver capable of driving large N-channel MOSFETs; a
precision undervoltage lockout function; 10碌A(chǔ) shutdown
current; short-circuit protection; and a programmable
soft-start function that directly controls output voltage
slew rates at startup which limits inrush current, mini-
mizes overshoot and facilitates supply sequencing.
The LT3724 is available in a 16-lead thermally enhanced
TSSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode is a registered trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 5731694, 6498466, 6611131.
APPLICATIO S
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Industrial Power Distribution
12V and 42V Automotive and Heavy Equipment
High Voltage Single Board Systems
Distributed Power Systems
Avionics
Telecom Power
TYPICAL APPLICATIO
V
IN
30V TO
60V
C
IN
68碌F
1M
High Voltage Step-Down Regulator
95
V
IN
BOOST
TG
LT3724
SHDN
68.1k
200k
C
SS
Burst_EN
V
FB
40.2k
V
C
680pF
120pF
4.99k
93.1k
3724 TA01a
0.22碌F
Si7852
0.025鈩?/div>
47碌H
SS3H9
SW
+
C
OUT
330碌F
EFFICIENCY (%)
V
OUT
24V
75W
V
CC
1碌F
PGND
SENSE
+
SENSE
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65
0.1
1
LOAD CURRENT (A)
1000pF
SGND
U
Efficiency and Power Loss
vs Load Current
12
10
EFFICIENCY
90
85
80
75
LOSS
70
V
IN
= 48V
0
10
3724 TA01b
U
U
POWER LOSS (W)
8
6
4
2
3724f
1

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