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| 型号： | LT1247CS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/12页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM CM 8-SOIC |
| 标准包装： | 100 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 100% |
| 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： | 0°C ~ 100°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
LT1246/LT1247
1MHz Off-Line
Current Mode PWM
and DC/DC Converter
FEATURE S
D ESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
s
Current Mode Operation to 1MHz
30ns Current Sense Delay
< 250 μ A Low Start-Up Current
Current Sense Leading Edge Blanking
Pin Compatible with UC1842
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
18V High Level Output Clamp
The LT ? 1246/LT1247 are 8-pin, fixed frequency, current
mode, pulse width modulators. These devices are de-
signed to be improved plug compatible versions of the
industry standard UC1842 PWM circuit. The LT1246/
LT1247 are optimized for off-line and DC/DC converter
applications. They contain a temperature compensated
reference, high gain error amplifier, current sensing com-
parator, 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 cur-
rent spikes in the totem pole output stage have been
eliminated, making 1MHz operation practical. Several new
features have been incorporated. Leading edge blanking
has been added to the current sense comparator. This
A PPLICATI
S
minimizes or eliminates the filter that is normally required.
Eliminating this filter allows the current sense loop to
s
s
Off-Line Converters
DC/DC Converters
operate with minimum delays. Trims have been added to
the oscillator circuit for both frequency and sink current,
and both of these parameters are tightly specified. The
Device
LT1246
LT1247
Start-Up
Threshold
16V
8.4V
Minimum
Operating
Voltage
10V
7.6V
Maximum
Duty Cycle
100%
100%
Replaces
UC1842
UC1843
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 under-voltage lockout.
, LTC and LT are registered trademarks of Linear Technology Corporation.
BLOCK D I AGRA
REFERENCE ENABLE
UV
LOCKOUT
R T /C T
4
OSCILLATOR
5V REF
MAIN BIAS
REFERENCE PULLDOWN
OUTPUT
PULLDOWN
S
8
7
6
V REF
V CC
OUTPUT
COMPENSATION
1
1mA
5.6V
1V
R
FEEDBACK
2
2.5V
–
2R
–
BLANKING
18V
5
GND
+
R
+
1.5V
+
I SENSE
3
–
LT1246 ? BD01
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1248 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Power Factor Controller |
| LT1248C | 制造商:LINER 制造商全称:Linear Technology 功能描述:Power Factor Controller |
| LT1248CN | 功能描述:IC PFC CTRLR AVERAGE CURR 16DIP RoHS:否 类别:集成电路 (IC) >> PMIC - PFC（功率因数修正） 系列:- 产品培训模块:GreenChip Synchronous Rectification Control Family of ICs 标准包装:1 系列:- 模式:间歇导电（DCM） 频率 - 开关:- 电流 - 启动:- 电源电压:8.6 V ~ 38 V 工作温度:-20°C ~ 150°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SO 包装:Digi-Reel® 其它名称:568-5348-6 |
| LT1248CN#PBF | 功能描述:IC PFC CTRLR AVERAGE CURR 16DIP RoHS:是 类别:集成电路 (IC) >> PMIC - PFC（功率因数修正） 系列:- 产品培训模块:GreenChip Synchronous Rectification Control Family of ICs 标准包装:1 系列:- 模式:间歇导电（DCM） 频率 - 开关:- 电流 - 启动:- 电源电压:8.6 V ~ 38 V 工作温度:-20°C ~ 150°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SO 包装:Digi-Reel® 其它名称:568-5348-6 |
| LT1248CN#PBF | 制造商:Linear Technology 功能描述:IC PFC CURRENT MODE 25V DI 制造商:Linear Technology 功能描述:IC, PFC, CURRENT MODE, 25V, DIP-16 |
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