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參數(shù)資料
| 型號： | LT1725 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Monolithic Switching Regulator for Isolated Flyback Controller(單片開關穩(wěn)壓器(用于隔離回掃控制器)) |
| 中文描述： | 單片開關穩(wěn)壓器（單片開關穩(wěn)壓器（用于隔離回掃控制器）的隔離反激式控制器） |
| 文件頁數(shù)： | 4/24頁 |
| 文件大小： | 252K |
| 代理商： | LT1725 |
4
LT1725
PIU
R
OCMP
(Pin 4):
Input pin for optional external load com-
pensation resistor. Use of this pin allows nominal com-
pensation for nonzero output impedance in the power
transformer secondary circuit, including secondary wind-
ing impedance, output Schottky diode impedance and
output capacitor ESR. In less demanding applications, this
resistor is not needed. See Applications Information for
more details.
R
CMPC
(Pin 5):
Pin for external filter capacitor for optional
load compensation function. A common 0.1
μ
F ceramic
capacitor will suffice for most applications. See Applica-
tions Information for further details.
OSCAP (Pin 6):
Pin for external timing capacitor to set
oscillator switching frequency. See Applications Informa-
tion for details.
V
C
(pin 7):
This is the control voltage pin which is the
output of the feedback amplifier and the input of the
current comparator. Frequency compensation of the
overall loop is effected in most cases by placing a capaci-
tor between this node and ground.
FB (Pin 8):
Input pin for external “feedback” resistor
divider. The ratio of this divider, times the internal band-
gap (V
BG
) reference, times the effective output-to-third
winding transformer turns ratio is the primary determi-
nant of the output voltage. The Thevenin equivalent resis-
tance of the feedback divider should be roughly 3k. See
Applications Information for more details.
3V
OUT
(Pin 9):
Output pin for nominal 3V reference. This
facilitates various user applications. This node is internally
current limited for protection and is intended to drive
either moderate capacitive loads of several hundred pF or
less, or, very large capacitive loads of 0.1
μ
F or more. See
Applications Information for more details.
UVLO (Pin 10):
This pin allows the use of an optional
external resistor divider to set an undervoltage lockout
based upon V
IN
(not V
CC
) level. (Note: If the V
CC
voltage is
sufficient to allow the part to start up, but the UVLO pin is
held below its threshold, output switching action will be
disabled, but the part will draw its normal quiescent
current from V
CC
. This typically causes a benign relaxation
oscillation action on the V
CC
pin in the conventional
“trickle-charge” bootstrapped configuration.)
The bias current on this pin is a function of the state of the
UVLO comparator; as the threshold is exceeded, the bias
current increases. This creates a hysteresis band equal to
the change in bias current times the Thevenin impedance
of the user’s resistive divider. The user may thereby adjust
the impedance of the UVLO divider to achieve a desired
degree of hysteresis. A 100pF capacitor to ground is
recommended on this pin. See Applications Information
for details.
SGND (Pin 11):
The signal ground pin is a clean ground.
The internal reference, oscillator and feedback amplifier
are referred to it. Keep the ground path connection to the
FB pin, OSCAP capacitor and the V
C
compensation capaci-
tor free of large ground currents.
MINENAB (Pin 12):
Pin for external programming resistor
to set minimum enable time. See Applications Information
for details.
ENDLY (Pin 13):
Pin for external programming resistor to
set enable delay time. See Applications Information for
details.
t
ON
(Pin 14):
Pin for external programming resistor to set
switch minimum on time. See Applications Information
for details.
V
CC
(Pin 15):
Supply voltage for the LT1725. Bypass this
pin to ground with 1
μ
F or more.
GATE (Pin 16):
This is the gate drive to the external power
MOSFET switch and has large dynamic currents flowing
through it. Keep the trace to the MOSFET as short as
possible to minimize electromagnetic radiation and volt-
age spikes. A series resistance of 5
or more may help to
dampen ringing in less than ideal layouts.
相關PDF資料 |
PDF描述 |
|---|---|
| LT1737CS | High Power Isolated Flyback Controller |
| LT1737IS | High Power Isolated Flyback Controller |
| 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穩(wěn)壓器) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT1725CGN | 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:- 標準包裝: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) |
| LT1725CGN#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:- 標準包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
| LT1725CGN#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,SSOP,16P |
| LT1725CGN#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:- 標準包裝: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) |
| LT1725CGN#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:- 標準包裝: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) |
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