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| 型号： | LT1245IS8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM CM 8-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 500kHz |
| 占空比： | 48% |
| 电源电压： | 8.2 V ~ 25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 100°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LT1241 Series
High Speed Current Mode
Pulse Width Modulators
FEATURE S
D ESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
s
Low Start-Up Current: < 250 μ A
50ns Current Sense Delay
Current Mode Operation: To 500kHz
Pin Compatible with UC1842 Series
Undervoltage Lockout with Hysteresis
No Cross-Conduction Current
Trimmed Bandgap Reference
1A Totem Pole Output
Trimmed Oscillator Frequency and Sink Current
Active Pull-Down on Reference and Output During
Undervoltage Lockout
High Level Output Clamp: 18V
Current Sense Leading Edge Blanking
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
A PPLICATI
S
current sense comparator. Trims have been added to the
oscillator circuit for both frequency and sink current, and
s
s
Off-Line Converters
DC/DC Converters
, LTC and LT are registered trademarks of Linear Technology Corporation.
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.
BLOCK D I AGRA
UV
REFERENCE ENABLE
LOCKOUT
5V REF
MAIN BIAS
REFERENCE PULL-DOWN
OUTPUT
PULL-DOWN
8
7
V REF
V CC
R T /C T
4
OSCILLATOR
T
S
6
OUTPUT
COMP
1
5.6V
1V
R
1mA
FB
2
2.5V
–
2R
–
BLANKING
18V
5
GND
+
R
+
+
1.5V
I SENSE
3
–
1241 BD01
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1245MJ8 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Current-Mode SMPS Controller |
| LT1245MJ8/883 | 制造商:Linear Technology 功能描述:Current Mode PWM Controller 1A 8-Pin CDIP |
| LT1245MJ8/883C | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Current-Mode SMPS Controller |
| LT1246 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1MHz Off-Line Current Mode PWM and DC/DC Converter |
| LT1246C | 制造商:LINER 制造商全称:Linear Technology 功能描述:1MHz Off-Line Current Mode PWM and DC/DC Converter |
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