Linear Technology LT1247
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 comparator, and a high current totem pole output stage ideally suited to driving power MOSFETs.| Part No. | LT1247 |
|---|---|
| Datasheet | LT1247 Download |
| Manufacturer |  Linear Technology |
| Description | 1MHz Off-Line Current Mode PWM and DC/DC Converter |
| Buy | Stock & Price |
FEATURES
s s s s s s s s s s s s Current Mode Operation to 1MHz 30ns Current Sense Delay < 250µA 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 APPLICATI s s S Off-Line Converters DC/DC Converters Start-Up Threshold 16V 8.4V Minimum Operating Voltage 10V 7.6V Maximum Duty Cycle 100% 100% Device LT1246 LT1247 Replaces UC1842 UC1843 BLOCK DIAGRA REFERENCE ENABLE 5V REF MAIN BIAS REFERENCE PULLDOWN OUTPUT PULLDOWN RT/CT COMPENSATION 4 1 1mA 5.6V OSCILLATOR S R 1V 2R R 5 GND 6 OUTPUT FEEDBACK 2 2.5V – + – + BLANKING ISENSE 3 U W UO UV LOCKOUT 8 7 VREF VCC 18V + 1.5V – LT1246● BD01 1 LT1246/LT1247 ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO TOP VIEW COMP 1 FB 2 ISENSE 3 RT/CT 4 N8 PACKAGE 8-LEAD PDIP S8 PACKAGE 8-LEAD PLASTIC SO TJMAX = 100°C, θJA = 130°C/W (N8) TJMAX = 100°C, θJA = 150°C/W (S8) Supply Voltage ....................................
