參數(shù)資料
型號(hào)： LT1737IS
廠(chǎng)商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： High Power Isolated Flyback Controller
中文描述： SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 0.150 INCH, PLASTIC, SO-16
文件頁(yè)數(shù)： 21/28頁(yè)
文件大?。?/td> 320K
代理商： LT1737IS
21
LT1737
1737f
TYPICAL APPLICATIO S
BASIC APPLICATION WITH
3-WINDING TRANSFORMER
Figure 8 shows a compact, low power application of the
LT1737. Transformer T1 is an off-the-shelf VERSA-PAC
TM
,
#VP1-0190, produced by Coiltronics. As manufactured, it
consists of six ideally identical independent windings. In
this application, two windings are stacked in series on the
primary side and three are placed in parallel on the
secondary side. This arrangement provides a 2:1 primary-
to-secondary turns ratio while maximizing overall effi-
ciency. The remaining primary side winding provides a
ground-referred version of the flyback voltage waveform
for the purpose of feedback.
The design accepts an input voltage in the range of 8V to
25V and outputs an isolated 5V. To prevent overvoltage on
the LT1737 and the gate of MOSFET M1, an LT1121 low
dropout linear regulator is employed (U2). Resistor di-
vider R11/R12 sets the output of U2 at nominally 8.25V. (A
few hundred millivolts of dropout will therefore be seen at
the very bottom of the input supply range.) The positive
going drive potential at the LT1737 GATE pin is typically 2V
or so below its V
CC
supply pin, so a logic level MOSFET has
been specified for M1.
Capacitor C6 sets the switching frequency at approxi-
mately 200kHz. Optimal load compensation for the
trans
former and secondary circuit components is set by
resistor R8. Resistor R10 provides a guaranteed mini-
mum load of about 20mA to maintain rough output voltage
regulation. The soft-start and UVLO features are unused
as shown.
PGND
I
SENSE
GATE
V
C
OSCAP
FB
R1
0.2
0.5W
IRC TYPE LR 2010
M1
IRLL014
R2
5.1
5%
1
10
7
3
T1
COILTRONICS
VP1-0190
6
4
2
5
R13
51
5%
V
CC
UVLO
3V
OUT
SGND
1737 F08
R
CMPC
R
OCMP
MINENAB
LT1737
R7
51k
5%
R6
51k
5%
C6
47pF
50V
NPO
6
8
7
3
9
10
15
16
2
1
2
8
3
14
R5
51k
5%
13
12
4
R8
4.3k
5%
5
11
1
ENDLY
SFST
t
ON
C5
1nF
25V
X7R
R9
68
5%
D2
1N5250
D3
MBR0540
R11
24k
5%
R12
20k
5%
C1: SANYO ALUMINUM ELECTROLYTIC (35CV331GX)
C2: SANYO POSCAP (10TPC68M)
C8: SANYO POSCAP (10TPA33M)
D1: MOTOROLA 30V, 3A SCHOTTKY RECTIFIER
D2: 20V, 500mW ZENER DIODE
D3: MOTOROLA 40V, 0.5A SCHOTTKY RECTIFIER
R4
3.92k
1%
R3
12.7k
1%
C3
1
μ
F
25V
Z5U
C1
330
μ
F
35V
V
IN
C7
0.1
μ
F
25V
Z5U
C9
1nF
25V
X7R
C4
470pF
50V
X7R
OUT
U2
LT1121
GND
ADJ
INP
11
8
12
D1
MBRD330
9
+
C2
68
μ
F
10V
+
C8
33
μ
F
10V
L1
1
μ
H
OPTIONAL OUTPUT FILTER
+
R10
240
5%
V
OUT
5V
500mA
V
OUT
5V
500mA
L1: COILCRAFT DO1608C-102 1
μ
H, 0.05
INDUCTOR
M1: INT’L RECTIFIER IRLL014 60V, 0.2
LOGIC LEVEL N-CH MOSFET
U2: LINEAR TECHNOLOGY MICROPOWER LDO REGULATOR
Figure 8. 8V-25V to Isolated 5V Converter
VERSA-PAC is a trademark of Coiltronics, Inc.
相關(guān)PDF資料
PDF描述
LT1737CGN High Power Isolated Flyback Controller
LT1737IGN High Power Isolated Flyback Controller
LT1737 High Power Switching Regulator for Isolated Flyback Controller(大功率，用于隔離回掃控制器的開(kāi)關(guān)穩(wěn)壓器)
LT1738 Slew Rate Controlled Ultralow Noise DC/DC Controller
LT1738EG Slew Rate Controlled Ultralow Noise DC/DC Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1737IS#PBF 功能描述:IC REG CTRLR FLYBK ISO CM 16SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
LT1737IS#PBF 制造商:Linear Technology 功能描述:ICSMPS CONTROLLERCURRENT-MOD 制造商:Linear Technology 功能描述:IC,SMPS CONTROLLER,CURRENT-MODE,SOP,16PI
LT1737IS#TR 功能描述:IC REG CTRLR FLYBK ISO CM 16SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
LT1737IS#TRPBF 功能描述:IC REG CTRLR FLYBK ISO CM 16SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤(pán) 包裝:帶卷 (TR)
LT1738 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Slew Rate Controlled Ultralow Noise DC/DC Controller
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