參數(shù)資料
型號(hào)： LT3845EFE#TR
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 4.40 MM, PLASTIC, TSSOP-16
文件頁(yè)數(shù)： 1/24頁(yè)
文件大?。?/td> 263K
代理商： LT3845EFE#TR
LT3845
1
3845fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
High Voltage Synchronous
Current Mode Step-Down
Controller with Adjustable
Operating Frequency
The LT
3845 is a high voltage, synchronous, current
mode controller used for medium to high power, high
efciency supplies. It offers a wide 4V to 60V input range
(7.5V minimum start-up voltage). An onboard regulator
simplies the biasing requirements by providing IC power
directly from VIN.
Burst Mode
operation maintains high efciency at light
loads by reducing IC quiescent current to 120μA. Light
load efciency is also improved with the reverse inductor
current inhibit function which supports discontinuous
operation.
Additional features include adjustable xed operating
frequency that can be synchronized to an external clock
for noise sensitive applications, gate drivers capable of
driving large N-channel MOSFETs, a precision undervoltage
lockout, 10μA shutdown current, short-circuit protection
and a programmable soft-start.
The LT3845 is available in a 16-lead thermally enhanced
TSSOP package.
■ High Voltage Operation: Up to 60V
■ Synchronizable Up to 600kHz
■ Adjustable Constant Frequency: 100kHz to 500kHz
■ Output Voltages Up to 36V
■ Adaptive Nonoverlap Circuitry Prevents Switch
Shoot-Through
■ Reverse Inductor Current Inhibit for Discontinuous
Operation Improves Efciency with Light Loads
■ Programmable Soft-Start
■ 120μA No Load Quiescent Current
■ 10μA Shutdown Supply Current
■ 1% Regulation Accuracy
■ Standard Gate N-Channel Power MOSFETs
■ Current Limit Unaffected by Duty Cycle
■ Reverse Overcurrent Protection
■ 16-Lead Thermally Enhanced TSSOP Package
■ 12V and 42V Automotive and Heavy Equipment
■ 48V Telecom Power Supplies
■ Avionics and Industrial Control Systems
■ Distributed Power Converters
, LT, LTC and LTM 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 5481178, 6611131, 6304066, 6498466, 6580258.
High Voltage Step-Down Regulator 48V to 12V at 75W
VIN
SHDN
CSS
BURST_EN
VFB
VC
SYNC
fSET
BOOST
TG
SW
VCC
BG
PGND
SENSE+
SENSE–
SGND
BAS521
1N4148
3845 TA01a
0.1
μF
1500pF
Si7370DP
B160
15
μH
0.01
Ω
LT3845
1
μF
33
μF
×3
VOUT
12V
75W
1M
82.5k
16.2k
VIN
20V TO 55V
2.2
μF
100V
49.9k
10k
100pF
680pF
143k
47
μF
63V
LOAD CURENT (A)
65
80
75
70
100
95
90
85
0
3
2
1
7
6
5
4
3845 TA01b
EFFICIENCY(%)
POWER
LOSS
(W)
0.1
10
1
VIN = 48V
LOSS
Efciency and Power Loss vs
Load Current
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