ON Semiconductor NCP1201 Page 12 Manual Download | Manualshive

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NCP1201

http://onsemi.com

12

Figure 30. MOSFET V

DS

at Various Power Levels, P1<P2<P3

P

1

= 0.4 W

P

2

= 1.8 W

P

3

= 3.6 W

315.4uS

882uS

1.450mS

2.017mS

2.585mS

300.0M

200.0M

100.0M

0

Skip Cycle
current limit

Max peak
current

Figure 31. The Skip Cycle Takes Place at Low Peak Current

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Summary of Contents for NCP1201

Page 1: ...down to a pre defined setpoint VSKIP value e g the output power demand diminishes the IC automatically enters the skip cycle mode and can provide excellent efficiency under light load conditions The s...

Page 2: ...3 C1 4 7 m 400 V 470 mH 0 2 A L1 C2 4 7 m 400 V R1 195 7 k R2 4 3 k C3 470 p 250 V R3 100 k 1 0 W 1N4937 D1 Q1 MTD1N60E C4 10 mF T1 D2 1N5819 47 mH 1 0 A L3 6 5 V 600 mA C6 10 m C5 10 m C7 1 0 n 250...

Page 3: ...iagram 50 mA Iref Output 80 K Output 1 07 V Reset Reset Q Set Enable Skip Cycle Comparator 60 or 100 kHz Clock Oscillator 10 5 V 12 5 V Output Internal Regulator Vref Overload Startup Blanking Output...

Page 4: ...CC capacitor MAXIMUM RATINGS TJ 25 C unless otherwise noted Rating Symbol Value Unit Power Supply Voltage Pin 6 VCC 0 3 16 V Input Output Pins Pins 1 2 3 5 VIO 0 3 6 5 V Maximum Voltage on Pin 8 HV VH...

Page 5: ...10 22 W CURRENT SENSE SECTION Pin 5 Unloaded Input Bias Current 1 0 V Input Level on Pin 3 IIB CS 10 100 nA Maximum Current Sense Input Threshold VILIMIT 0 8 0 9 1 0 V Default Current Sense Threshold...

Page 6: ...T SOURCE mA 5 0 3 5 2 0 0 5 6 5 VCC 11 V 1 nF Load Figure 3 VCC OFF Threshold Voltage vs Junction Temperature TJ JUNCTION TEMPERATURE C 125 100 75 50 25 0 25 10 8 VCC ON V CC ON THRESHOLD VOLTAGE V 10...

Page 7: ...ture TJ JUNCTION TEMPERATURE C 125 100 75 50 25 0 25 12 I IB CS CS PIN INPUT BIAS CURRENT nA 10 9 7 6 8 11 TJ JUNCTION TEMPERATURE C 125 100 75 50 25 0 25 70 R OH SOURCE RESISTANCE W 60 40 30 0 TJ JUN...

Page 8: ...nS 85 55 40 10 TJ JUNCTION TEMPERATURE C 125 100 75 50 25 0 25 400 T LEB LEADING EDGE BLANKING DURATION nS 250 100 0 50 300 TJ JUNCTION TEMPERATURE C 125 100 75 50 25 0 25 120 F OSC OSCILLATOR FREQUE...

Page 9: ...50 25 0 25 1 15 V SKIP SKIP CYCLE COMPARATOR THRESHOLD VOLTAGE V 1 10 1 05 1 00 0 95 TJ JUNCTION TEMPERATURE C 125 100 75 50 25 0 25 19 R UP INTERNAL PULLUP RESISTOR kW 18 16 13 TJ JUNCTION TEMPERATU...

Page 10: ...arge Discharge Cycle Over a 10 mF VCC Capacitor 10 mS 30 mS 50 mS 70 mS 90 mS Current Source OFF VCC Output Pulses Vripple 2 V VCCOFF 12 5 V VCCON 10 5 V ON The DSS behavior actually depends on the in...

Page 11: ...reshold level 1 07 V the IC prevents the current from decreasing further down and starts to blank the output pulses i e the controller enters the so called Skip Cycle Mode also named Controlled Burst...

Page 12: ...30 MOSFET VDS at Various Power Levels P1 P2 P3 P1 0 4 W P2 1 8 W P3 3 6 W 315 4uS 882uS 1 450mS 2 017mS 2 585mS 300 0M 200 0M 100 0M 0 Skip Cycle current limit Max peak current Figure 31 The Skip Cycl...

Page 13: ...below 1 92 V a reset signal will be generated via internal protection logic to the PWM Latch to turn off the Power Switch immediately At the same time an internal current source controlled by the stat...

Page 14: ...e device temporarily and authorize its restart once the control signal has disappeared This option can easily be accomplished through a single NPN bipolar transistor wired between FB and ground By pul...

Page 15: ...V No synchronization between DSS and fault event Time Time Time Drv FB Calculating the VCC Capacitor As the above section describes the fall down sequence depends upon the VCC level i e how long does...

Page 16: ...king about ms pulses the amount of injected charge Q I x t immediately latches the controller which brutally discharges its VCC capacitor If this VCC capacitor is of sufficient value its stored energy...

Page 17: ...2500 Units Tape Reel NCP1201D60R2G SOIC 8 Pb Free NCP1201P100 PDIP 8 50 Units Rail NCP1201P100G PDIP 8 Pb Free NCP1201D100R2 SOIC 8 2500 Units Tape Reel NCP1201D100R2G SOIC 8 Pb Free For information o...

Page 18: ...U 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 0 0...

Page 19: ...nded or authorized for use as components in systems intended for surgical implant into the body or other applications intended to support or sustain life or for any other application in which the fail...

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