參數(shù)資料
型號(hào): LT1725
廠(chǎng)商: Linear Technology Corporation
英文描述: Monolithic Switching Regulator for Isolated Flyback Controller(單片開(kāi)關(guān)穩(wěn)壓器(用于隔離回掃控制器))
中文描述: 單片開(kāi)關(guān)穩(wěn)壓器(單片開(kāi)關(guān)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(yè)數(shù): 3/24頁(yè)
文件大?。?/td> 252K
代理商: LT1725
3
LT1725
Note 1:
Absolute Maximum Ratings are those values beyond which the life of
a device may be impaired.
Note 2:
Component value range guaranteed by design.
The
G
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25
°
C. V
CC
= 14V, GATE open, V
C
= 1.4V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
Current Amplifier
V
C
Control Pin Threshold
Duty Cycle = Min
ELECTRICAL CHARACTERISTICS
MIN
TYP
MAX
UNITS
0.90
0.80
220
200
1.12
1.25
1.35
270
280
V
V
G
V
ISENSE
Switch Current Limit
Duty Cycle
30%
Duty Cycle
30%
Duty Cycle = 80%
250
mV
mV
mV
mV
G
220
0.30
V
ISENSE
/
V
C
Timing
f
Switching Frequency
C
OSCAP
= 100pF
90
80
33
100
115
125
200
kHz
kHz
pF
ns
ns
ns
k
%
G
C
OSCAP
t
ON
t
ED
t
EN
R
t
Oscillator Capacitor Value
Minimum Switch On Time
Flyback Enable Delay Time
Minimum Flyback Enable Time
Timing Resistor Value
Maximum Switch Duty Cycle
Load Compensation
Sense Offset Voltage
Current Gain Factor
UVLO Function
V
UVLO
UVLO Pin Threshold
I
UVLO
UVLO Pin Bias Current
(Note 2)
R
tON
= 50k
R
ENDLY
= 50k
R
MENAB
= 50k
(Note 2)
200
200
200
24
85
200
G
90
2
5
mV
mV
0.80
0.95
1.05
G
1.21
–0.25
–4.50
1.25
+0.1
–3.5
1.29
+0.25
–2.50
V
V
UVLO
= 1.2V
V
UVLO
= 1.3V
μ
A
μ
A
3V Output Function
V
REF
Reference Output Voltage
Output Impedance
Current Limit
I
LOAD
= 1mA
G
2.8
3.0
10
15
3.2
V
G
8
mA
PIU
PGND (Pin 1):
The power ground pin carries the GATE
node discharge current. This is typically a current spike of
several hundred mA with a duration of tens of nanosec-
onds. It should be connected directly to a good quality
ground plane.
I
SENSE
(Pin 2):
Pin to measure switch current with exter-
nal sense resistor. The sense resistor should be of a
noninductive construction as high speed performance is
essential. Proper grounding technique is also required to
avoid distortion of the high speed current waveform. A
preset internal limit of nominally 250mV at this pin effects
a switch current limit.
SFST (Pin 3):
Pin for optional external capacitor to effect
soft-start function. See Applications Information for details.
相關(guān)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(kāi)關(guān)穩(wěn)壓器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT1725CGN 功能描述:IC REG CTRLR FLYBK ISO CM 16SSOP 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)
LT1725CGN#PBF 功能描述:IC REG CTRLR FLYBK ISO CM 16SSOP 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:2,000 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(wú) 升壓:是 回掃:是 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 ~ 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(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)
LT1725CGN#TRPBF 功能描述:IC REG CTRLR FLYBK ISO CM 16SSOP 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)