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LT1243 Datasheet(PDF) 1 Page - Linear Technology |
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LT1243 Datasheet(HTML) 1 Page - Linear Technology |
1 / 16 page 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 µA. 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 µA 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 DESCRIPTIO S FEATURE S APPLICATI 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 I DAGRA BLOCK |
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