參數(shù)資料
型號： LT1737IS
廠商： LINEAR TECHNOLOGY CORP
元件分類： 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
文件頁數(shù)： 24/28頁
文件大小： 320K
代理商： LT1737IS
24
LT1737
1737f
TYPICAL APPLICATIO S
R3 and D2. (Diode D2 prevents reverse emitter/base
breakdown in Q1 when MOSFET M1 is in the “ON” state.)
The raw flyback voltage at the drain of MOSFET M1 minus
the V
BE
of Q1 is converted to a current by R3 and then back
to a voltage at R4. Or, stated mathematically:
V
V
V
R
R
FB
FLBK
BE
=
(
)
–
4
3
Resistor R13 provides an initial pre-load to the supply
output to improve light load regulation. Resistor divider
R8/R9 sets the undervoltage lockout threshold at nomi-
nally 10.4V for turn-on, with turn-off about 600mV lower.
Overall power supply efficiency and output regulation
versus input voltage and load current may be seen in
Figures 13 and 14.
5V
IN
APPLICATION
The LT1737 is a bipolar technology IC specified to operate
down to a minimum input supply voltage of 4.5V. Although
its GATE pin drives “l(fā)ow” nearly to ground, its “high”
capability is limited by a headroom requirement of roughly
2V
BE
s. Thus when operating at a worst case 4.5V supply,
the GATE output will only drive up to a nominal 3V or so.
Fortunately, MOSFETs are now available with specified
performance at this level of gate voltage.
The circuit shown in Figure 15 provides an isolated 5V
output from an input between 4.5V and 5.5V. Two Si9804
low gate voltage MOSFETs are paralleled to handle the
primary-side current—up to 12A peak. This circuit pro-
vides more output power than the previous examples. It
PGND
I
SENSE
GATE
V
C
OSCAP
FB
R1
0.02
M1
SI9804
10
4
9
T1
COILTRONICS
VP5-0083
V
IN
3
V
CC
UVLO
3V
OUT
SGND
1737 F15
R
CMPC
R
OCMP
MINENAB
LT1737
R6
51k
5%
R5
51k
5%
C5
47pF
50V
NPO
6
8
7
3
9
10
15
16
2
14
R4
75k
5%
13
12
4
R7
2.2k
5%
5
11
1
ENDLY
SFST
t
ON
C3
1nF
25V
X7R
R8
10
5%
D4
1N5240
D3
MBR0520
C1A-B, C2A-B: SANYO POSCAP (10TPB220M)
D1: MOTOROLA 35V, 8A SCHOTTKY DIODE
D2: SIGNAL DIODE
D3: MOTOROLA 20V, 0.5A SCHOTTKY DIODE
D4: 10V, 500mW ZENER DIODE
M1, M2: SILICONIX/VISHAY 25V, 0.023
N-CH MOSFET
R1: 5
×
0.10
, 1W (IRC LR2512)
T1: COILTRONICS TRANSFORMER
R3
3.01k
1%
C8
1
μ
F
25V
Z5U
C4
0.1
μ
F
25V
Z5U
C9
1nF
25V
X7R
R11
51
5%
11
2
12
1
M2
SI9804
C6
4.7nF
50V
X7R
C7
2.2nF
50V
X7R
5
8
6
7
D1
MBRD835L
C2A
220
μ
F
10V
+
C2B
220
μ
F
10V
+
R10
270
5%
V
OUT
5V
3A
R9
15
5%
D2
BAS16
Q1
2N3906
R2
11.0k
1%
C1A
220
μ
F
10V
+
C1B
220
μ
F
10V
+
Figure 15. 4.5V-5.5V to Isolated 5V Converter
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 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 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 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LT1737IS#TRPBF 功能描述:IC REG CTRLR FLYBK ISO CM 16SOIC RoHS:是 類別: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 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LT1738 制造商:LINER 制造商全稱:Linear Technology 功能描述:Slew Rate Controlled Ultralow Noise DC/DC Controller
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺，查看報(bào)價(jià)

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*