參數(shù)資料
型號(hào)： LT1737IGN
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, SSOP-16
文件頁(yè)數(shù)： 17/28頁(yè)
文件大小： 320K
代理商： LT1737IGN
17
LT1737
1737f
V
IN
UVLO
R1
R2
V
IN
UVLO
R1
R2
C1
100pF
V
IN
UVLO
R1/2
R1/2
R2
1737 F06
C2
C1
100pF
APPLICATIOU
W
U
U
Figure 6
FREQUENCY COMPENSATION
Loop frequency compensation is performed by connect-
ing a capacitor from the output of the error amplifier (V
C
pin) to ground. An additional series resistor, often re-
quired in traditional current mode switcher controllers, is
usually not required and can even prove detrimental. The
phase margin improvement traditionally offered by this
extra resistor will usually be already accomplished by the
nonzero secondary circuit impedance, which adds a “zero”
to the loop response.
In further contrast to traditional current mode switchers,
V
C
pin ripple is generally not an issue with the LT1737. The
dynamic nature of the clamped feedback amplifier forms
an effective track/hold type response, whereby the V
C
voltage changes during the flyback pulse, but is then “held”
during the subsequent “switch on” portion of the next
cycle. This action naturally holds the V
C
voltage stable
during the current comparator sense action (current mode
switching).
OUTPUT VOLTAGE ERROR SOURCES
Conventional nonisolated switching power supply ICs
typically have only two substantial sources of output
voltage error: the internal or external resistor divider
network that connects to V
OUT
and the internal IC refer-
ence. The LT1737, which senses the output voltage in both
a dynamic and an isolated manner, exhibits additional
potential error sources to contend with. Some of these
errors are proportional to output voltage, others are fixed
in an absolute millivolt sense. Here is a list of possible
error sources and their effective contribution.
Internal Voltage Reference
The internal bandgap voltage reference is, of course,
imperfect. Its error, both at 25
°
C and over temperature is
already included in the specifications.
User Programming Resistors
Output voltage is controlled by the user-supplied feedback
resistor divider ratio. To the extent that the resistor ratio
differs from the ideal value, the output voltage will be
proportionally affected. Highest accuracy systems will
demand 1% components.
Schottky Diode Drop
The LT1737 senses the output voltage from the trans-
former primary side during the flyback portion of the
cycle. This sensed voltage therefore includes the forward
drop, V
F
, of the rectifier (usually a Schottky diode). The
nominal V
F
of this diode should therefore be included in
feedback resistor divider calculations. Lot to lot and
ambient temperature variations will show up as output
voltage shift/drift.
Secondary Leakage Inductance
Leakage inductance on the transformer secondary re-
duces the effective secondary-to-third winding turns ratio
(N
S
/N
T
) from its ideal value. This will increase the output
voltage target by a similar percentage. To the extent that
secondary leakage inductance is constant from part to
part, this can be accommodated by adjusting the feedback
resistor ratio.
(6c) Recommended Topology to
Filter High Frequency Ripple
(6b) Filter Capacitor
Directly on UVLO Note
(6a) “Standard” UVLO
Divider Topology
相關(guān)PDF資料
PDF描述
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
LT1738IG Slew Rate Controlled Ultralow Noise DC/DC Controller
LT1761ES5-2 100mA, Low Noise, LDO Micropower Regulators in SOT-23
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1737IGN#PBF 功能描述:IC REG CTRLR FLYBK ISO CM 16SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無(wú) 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:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤(pán) 包裝:Digi-Reel® 產(chǎn)品目錄頁(yè)面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR
LT1737IGN#PBF 制造商:Linear Technology 功能描述:IC, ISOLATED FLYBACK CONTROLLER, SSOP-16
LT1737IGN#TR 功能描述:IC REG CTRLR FLYBK ISO CM 16SSOP 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(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)
LT1737IGN#TRPBF 功能描述:IC REG CTRLR FLYBK ISO CM 16SSOP 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(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 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(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)
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

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

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

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*