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参数资料
| 型号： | LT1242CJ8 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, CDIP8 |
| 封装： | 0.300 INCH, HERMETIC SEALED, CERDIP-8 |
| 文件页数： | 1/16页 |
| 文件大小： | 284K |
| 代理商： | LT1242CJ8 |
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
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 VOUT 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
s
Low Start-Up Current: < 250
A
s
50ns Current Sense Delay
s
Current Mode Operation: To 500kHz
s
Pin Compatible with UC1842 Series
s
Undervoltage Lockout with Hysteresis
s
No Cross-Conduction Current
s
Trimmed Bandgap Reference
s
1A Totem Pole Output
s
Trimmed Oscillator Frequency and Sink Current
s
Active Pull-Down on Reference and Output During
Undervoltage Lockout
s
High Level Output Clamp: 18V
s
Current Sense Leading Edge Blanking
D
U
ESCRIPTIO
S
FEATURE
U
S
A
O
PPLICATI
s
Off-Line Converters
s
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
ISENSE
BLANKING
1mA
5.6V
4
RT/CT
OSCILLATOR
R
S
18V
7VCC
5
GND
6
OUTPUT
8
VREF
5V REF
MAIN BIAS
REFERENCE PULL-DOWN
OUTPUT
PULL-DOWN
REFERENCE ENABLE
1241 BD01
T
UV
LOCKOUT
W
I
DAGRA
BLOCK
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| LT1303CS8-5#TR | 0.75 A SWITCHING REGULATOR, 155 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT1307IS8#TRPBF | 1.25 A SWITCHING REGULATOR, 750 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT1374IR-SYNC#TR | 8.5 A SWITCHING REGULATOR, 560 kHz SWITCHING FREQ-MAX, PSSO7 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1242CN8 | 功能描述:IC REG CTRLR ISO PWM CM 8-DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT1242CN8#PBF | 功能描述:IC REG CTRLR ISO PWM CM 8-DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT1242CS8 | 功能描述:IC REG CTRLR ISO PWM CM 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT1242CS8#PBF | 功能描述:IC REG CTRLR ISO PWM CM 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT1242CS8#TR | 功能描述:IC REG CTRLR ISO PWM CM 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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