LT1738 查看數據表（PDF） - Linear Technology
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LT1738 Datasheet PDF : 20 Pages
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LT1738
TYPICAL APPLICATIO
Ultralow Noise 30W Offline Power Supply
X1
90VAC
TO 264VAC
DANGER: HIGH VOLTAGE
L1
1M
0.1µF
250VAC
“X2”
1M
X3
VBIAS
100k
2W
12V
IN755 A
+
510k
56µF
17
35V
VIN
14
SHDN
+
BR1
10Ω
19
10
NC NFB
100µF
400V
470pF
P6KE200A
MUR160
KA
D4
BA521
5pF
600V
1 T1 11
37
6 12
5
8
D1
A1
A2
C2 +
330µF
25V
+VOUT
12V
2.5A
+ C3
330µF
25V
+ C4
330µF
25V
– VOUT
510k
165k
165k
2N2222
2N2222
51k
5
V5
5pF
1.8nF
19.6k
3.9k
3.9k
6
SYNC
2
CAP
7
CT
8
RT
U3
LT1738
1
GATE
4
CS
16
RVSL
18
NC
15
RCSL
20
PGND
9
FB
SS GND
13
11
10nF
12
VC
GCL
3
VBIAS
MTP2N60E
0.068Ω
1/2W
6
5
ISO1
1k
CNY17-3
31
2
4
0.1µF 1k
VOUT
3
2
V+
COMP
U2 REF
8
LT1431
COLL
RTOP
4
7
RMIO
G-F G-S
6
5
0.22µF
38.3k
1%
1k
10k
1%
UNLESS OTHERWISE NOTED: ALL RESISTORS 1206, 5%
BR1: GENERAL INSTRUMENTS W06G
C2, C3, C4: SANYO MV-GX
D1: MBR20200CT
L1: HM18-10001
T1: PREMIER MAGNETICS POL-15033
NOTE: PIN 2 OF LT1738 MUST BE LAID OUT
AWAY FROM FAST SLEWING NODES
1738 TA02
INPUT FILTER IS REQUIRED TO ATTENUATE SWITCHING FREQUENCY HARMONICS AND PASS FCC CLASS B (LT1738 DOES NOT ATTENUATE THESE LOW FREQUENCY HARMONICS)
MAIN ADVANTAGE WITH LT1738 IS IT MAKES SUPPRESSING THE HIGH FREQUENCY NOISE AND EMI EASY. THIS IS PARTICULARLY USEFUL FOR MEDICAL DEVICES BECAUSE
THE AC LINE TO EARTH GND CAPS ON THE INPUT FILTER CAN BE ELIMINATED; ALLOWING THE DEVICE TO PASS THE EARTH GND LEAKAGE CURRENT MEDICAL SPECIFICATIONS.
RELATED PARTS
PART NUMBER
LT1683
LT1425
LT1533
LT1534
LT1576
LT176X Family
LT1777
LTC1922-1
DESCRIPTION
Ultralow Noise Push-Pull DC/DC Controller
Isolated Flyback Switching Regulator
Ultralow Noise 1A Switching Regulator
Ultralow Noise 2A Switching Regulator
1.5A, 200kHz Step-Down Switching Regulator
Low Dropout, Low Noise Linear Regulator
Low Noise Step-Down Switching Regulator
Synchronous Phase Modulated Full-Bridge Controller
LT3439
Ultralow Noise Transformer Driver
DirectSense is a trademark of Linear Technology Corporation.
20 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507 q www.linear.com
COMMENTS
Dual Output (Push-Pull) Current Mode Architecture.
Excellent Regulation without Transformer “Third Winding”
Push-Pull Design for Low Noise Isolated Supplies
Ultralow Noise Regulator for Boost Topologies
Constant Frequency, 1.21V Reference Voltage
150mA to 3A, SOT-23 to TO-220
Programmable dI/dt; Internally Limited dV/dt
Adaptive DirectSenseTM Zero Voltage Switching, 50W to
Kilowatts, Synchronous Rectification
1A Push-Pull DC/DC Transformer Driver
1738fa
LT/TP 1202 1K REV A • PRINTED IN USA
© LINEAR TECHNOLOGY CORPORATION 2001
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