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參數(shù)資料
| 型號(hào)： | LT1241 Series |
| 廠商： | Linear Technology Corporation |
| 英文描述： | High Speed Current Mode Pulse Width Modulators(高速，電流模式脈寬調(diào)制器) |
| 中文描述： | 高速電流模式脈寬調(diào)制器（高速，電流模式脈寬調(diào)制器） |
| 文件頁數(shù)： | 1/16頁 |
| 文件大小： | 284K |
| 代理商： | LT1241 SERIES |
1
LT1241 Series
The LT
1241 series devices are 8-pin, fixed frequency,
current mode, pulse width modulators. They are improved
plug compatible versions of the industry standard UC1842
series. These devices have both improved speed and
lower quiescent current. The LT1241 series is optimized
for off-line and DC/DC converter applications. They con-
tain a temperature-compensated reference, high gain er-
ror amplifier, current sensing comparator and a high
current totem pole output stage ideally suited to driving
power MOSFETs. Start-up current has been reduced to
less than 250
μ
A. Cross-conduction current spikes in
the output stage have been eliminated, making 500kHz
operation practical. Several new features have been incor-
porated. Leading edge blanking has been added to the
current sense comparator. Trims have been added to the
oscillator circuit for both frequency and sink current, and
both of these parameters are tightly specified. The output
stage is clamped to a maximum V
OUT
of 18V in the
on state. The output and the reference output are actively
pulled low during undervoltage lockout.
High Speed Current Mode
Pulse Width Modulators
I
Low Start-Up Current: <250
μ
A
I
50ns Current Sense Delay
I
Current Mode Operation: To 500kHz
I
Pin Compatible with UC1842 Series
I
Undervoltage Lockout with Hysteresis
I
No Cross-Conduction Current
I
Trimmed Bandgap Reference
I
1A Totem Pole Output
I
Trimmed Oscillator Frequency and Sink Current
I
Active Pull-Down on Reference and Output During
Undervoltage Lockout
I
High Level Output Clamp: 18V
I
Current Sense Leading Edge Blanking
D
U
ESCRIPTIO
S
FEATURE
U
S
A
O
PPLICATI
I
Off-Line Converters
I
DC/DC Converters
, LTC and LT are registered trademarks of Linear Technology Corporation.
+
–
+
–
1
2
FB
COMP
2.5V
2R
R
1V
1.5V
–
+
3
I
SENSE
BLANKING
1mA
5.6V
4
R
T
/C
T
OSCILLATOR
R
S
18V
7
V
CC
5
GND
6
OUTPUT
8
V
REF
5V REF
MAIN BIAS
REFERENCE PULL-DOWN
OUTPUT
PULL-DOWN
REFERENCE ENABLE
1241 BD01
T
UV
LOCKOUT
W
I
D AGRA
BLOCK
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1248 | Octal D-Type Transparent Latches with 3-state Outputs 20-SO 0 to 70 |
| LT1248C | Octal D-Type Transparent Latches with 3-state Outputs 20-SO 0 to 70 |
| LT1248CN | Octal D-Type Transparent Latches with 3-state Outputs 20-SO 0 to 70 |
| LT1248CS | Replaced by SN74ALS374A : Octal D-Type Edge Triggered Flip-Flops with 3-State Outputs 20-SSOP 0 to 70 |
| LT1248I | Power Factor Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1242 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Speed Current Mode Pulse Width Modulators |
| LT1242CJ8 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Mode SMPS Controller |
| LT1242CN8 | 功能描述:IC REG CTRLR ISO PWM CM 8-DIP 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) |
| LT1242CN8#PBF | 功能描述:IC REG CTRLR ISO PWM CM 8-DIP 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) |
| LT1242CS8 | 功能描述:IC REG CTRLR ISO PWM CM 8-SOIC 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) |
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