LT1245是High Speed Current Mode Pulse Width Modulators

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LT1245 - LT1245是High Speed Current Mode Pulse Width Modulators

LT1245是Linear公司的一款PWM 控制器产品，LT1245是High Speed Current Mode Pulse Width Modulators，本站介绍了LT1245的封装应用图解、特点和优点、功能等，并给出了与LT1245相关的凌力尔特元器件型号供参考。

LT1245 - High Speed Current Mode Pulse Width Modulators

LT1245 - High Speed Current Mode Pulse Width Modulators - Linear Technology（凌力尔特）

功能描述

The LT1241 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 contain a temperature-compensated reference, high gain error 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 250µA. Cross-conduction current spikes in the output stage have been eliminated, making 500kHz operation practical. Several new features have been incorporated. 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.

特点

Low Start-Up Current: <250µA

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

应用

Off-Line Converters

DC/DC Converters

以下列出了不同封装及包装形式的具体型号,并标出了直接在linear官网上订货的价格（美元）

器件型号	封装	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量)
LT1245CN8	N-8	C	$2.33	$1.95
LT1245CN8#PBF	N-8	C	$2.33	$1.95
LT1245CS8	SO-8	C	$2.58	$2.20
LT1245CS8#PBF	SO-8	C	$2.58	$2.20
LT1245CS8#TR	SO-8	C		$2.26
LT1245CS8#TRPBF	SO-8	C		$2.26
LT1245IN8	N-8	I	$2.58	$2.20
LT1245IN8#PBF	N-8	I	$2.58	$2.20
LT1245IS8	SO-8	I	$2.83	$2.40
LT1245IS8#PBF	SO-8	I	$2.83	$2.40
LT1245IS8#TR	SO-8	I		$2.46
LT1245IS8#TRPBF	SO-8	I		$2.46