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NCP1215

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NCP1215/D

The product described herein (NCP1215), may be covered by the following U.S. patents: 6,385,060, 6,605,978. There may be other patents pending.

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Содержание NCP1215

Страница 1: ...tages over a traditional approach by avoiding the voltage drop incurred by traditional MOSFET source sensing Thus the IC drive capability is greatly improved Finally the bulk input ripple ensures a na...

Страница 2: ...res a gate source resistor please refer to design guidelines in this document Figure 2 Representative Block Diagram Feedback Loop Control FB Off Time Comparator CT Voffset 0 7 V 10 mA 12 5 50 mA CS GN...

Страница 3: ...age Vcc 18 V FB Pins Voltage Range VFB 0 3 to 18 V CS and CT Pin Voltage Range Vin 0 3 to 10 V Thermal Resistance Junction to Air SOIC 8 Version RqJA 178 C W Junction Temperature TJ 150 C Storage Temp...

Страница 4: ...um CT Pin Voltage Pin Unloaded Discharge Switch Turned On VCT min 20 mV CURRENT SENSE Minimum Source Current IFB 180 mA CT Pin Grounded ICS min 8 0 12 5 16 mA Maximum Source Current IFB 0 mA CT Pin Gr...

Страница 5: ...Temperature TJ JUNCTION TEMPERATURE C Figure 7 Current Sense Source Current vs Junction Temperature TJ JUNCTION TEMPERATURE C Figure 8 Current Sense Threshold vs Junction Temperature TJ JUNCTION TEMP...

Страница 6: ...CT pin Threshold vs Junction Temperature Figure 11 Drive Sink and Source Resistance vs Junction Temperature Figure 12 Current Sense Source Current vs Feedback Current Ifb FEEDBACK CURRENT mA 60 0 0 0...

Страница 7: ...hile switching Furthermore the programming resistor together with the pin capacitance forms a residual noise filter which blanks spurious spikes Also fixing primary current level to a maximum value se...

Страница 8: ...current source via an external capacitor controls the switch off time This is portrayed in Figure 17 Figure 17 OFF Time Control CT Voffset 10 mA From Feedback Loop Block Voffset to VDD To Latch s Set...

Страница 9: ...ding internal circuitry The gate drive capability is improved because the current sense resistor is located out of the gate driver loop and does not deteriorate the turn on and also turn off gate driv...

Страница 10: ...As output power diminishes the switching frequency decreases because the switch off time prolongs upon feedback loop The range of the frequency change is sufficient to keep output voltage regulation...

Страница 11: ...oosing the voltage drop across the current sense resistor Let s use a value of 0 5 V The value of the current sense resistor can then be evaluated as follows eq 24 RCS VCS Ippk 0 5 0 2047 2 442 W 2 7...

Страница 12: ...500 V C7 D8 MURA160T3 MTD1N60 Q1 1 2 3 4 5 8 D9 MBRS360T3 J3 1 6 5 V 800 mA L2 4 7 mH C9 470 mF 16 V R8 220 10 mF 16 V C10 BZX84C5V6 R9 1 k D7 J4 1 GND ISO1 PC817 T1 C8 1 nF Y The following oscillosc...

Страница 13: ...MOSFET gate and source connections This can preclude an eventual MOSFET destruction if in the production stage the converter is powered whilst the gate is left unconnected However dealing with an extr...

Страница 14: ...THRU 751 06 ARE OBSOLETE NEW STANDARD IS 751 07 A B S D H C 0 10 0 004 DIM A MIN MAX MIN MAX INCHES 4 80 5 00 0 189 0 197 MILLIMETERS B 3 80 4 00 0 150 0 157 C 1 35 1 75 0 053 0 069 D 0 33 0 51 0 013...

Страница 15: ...0 0102 0 10 0 26 K 0 0079 0 0236 0 20 0 60 L 0 0493 0 0610 1 25 1 55 M 0 10 0 10 S 0 0985 0 1181 2 50 3 00 _ _ _ _ NOTES 1 DIMENSIONING AND TOLERANCING PER ANSI Y14 5M 1982 2 CONTROLLING DIMENSION MI...

Страница 16: ...occur Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application Buyer shall indemnify and hold SCILLC and its officers employees subsidiaries affiliates and dis...

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