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參數(shù)資料
| 型號： | 3710EFE |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Secondary Side Synchronous Post Regulator |
| 中文描述： | 二次側同步后穩(wěn)壓器 |
| 文件頁數(shù)： | 11/12頁 |
| 文件大?。?/td> | 226K |
| 代理商： | 3710EFE |
LT3710
11
3710f
forward converter with synchronous rectification. The
primary side controller uses an LT3781, a current mode
2-transistor forward controller with built-in MOSFET driv-
ers. On the secondary side, an LTC1698 is used to provide
the voltage feedback for the 3.3V output, as well as the gate
drive for the synchronous MOSFETs. The error amplifier
output is fed into the optocoupler and then relayed to
LT3781 on the primary side to complete the 3.3V regula-
tion. The 1.8V output is generated by the LT3710 circuit.
A planar transformer PA0191 built by Pulse Engineering is
employed as the power transformer in this design. This
transformer is constructed on a PQ20 core with a nine turn
primary winding, two turn secondary winding and seven
turn auxiliary winding for the LT3781 bias supply. Because
the maximum secondary voltage V
SP
is about 16V, 30V
MOSFETs are chosen with the consideration that the
secondary voltage overshoot is typically 20% to 30% of
V
SP
. In this particular design, Si7440DP is selected due to
its low R
SD(ON)
, 30V V
DSS
rating and its compact and
thermally enhanced PowerPak SO-8 package.
The switching frequency of the circuit is about 230kHz.
1500V input to output isolation is provided. Additional
features of this design include primary side on/off control,
±
5% secondary side trimming on the 3.3V output, input
overvoltage protection and undervoltage lockout. The
complete design will mount within a standard half brick PC
board with about half inch height.
Figure 3b. 36V to 72V DC to 3.3V/10A and 1.8V/10A Dual Output Isolated Power Supply (Part 2 of 2, See Previous Page)
SYNC
SS
V
CC
CSET
PGND
ILCOMP
PGND
GBIAS
TGATE
SW
BGATE
BGS
CL
+
11
CL
–
12
BOOST
VA
OUT
LT3710
3.3k
0.033
μ
F
0.01
μ
F
B340A
V
1.8V/10A
1.8
μ
H
SUMIDA
CEP125-IR8
0.006
1%
16
2
3
15
9
V
FB
5
7
13
4
14
6
8
1
10
17
0.01
μ
F
10pF
1
μ
F
V
CCS
0.1
μ
F
16V
Si7440DP
Si7440DP
220
3710 F03b
330pF
4.7
μ
F
16V
CMDSH-3
CMDSH-3
10
10k
10k
180pF
C37 680pF
SEC
2.32k
1%
3.01k
1%
680
μ
F
4V
POSCAP
+
680
μ
F
4V
POSCAP
+
4700pF
APPLICATIU
W
U
U
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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