PWM Current-Mode Controller

NCP1201 PWM Current−Mode Controller for Universal Off−Line Supplies Featuring Low Standby Power with Fault Protection Modes Housed in SOIC−8 or PDIP−8 package, the NCP1201 enhances the previous NCP1200 series by offering a reduced optocoupler current with additional Brownout Detection Protection (BOK). Similarly, the circuit allows the implementation of complete off−line AC−DC adapters, battery chargers or Switchmode Power Supplies (SMPS) where standby power is a key parameter. The NCP1201 features efficient protection circuitry. When in the presence of a fault (e.g. failed optocoupler, overcurrent condition, etc.) the control permanently disables the output pulses to avoid subsequent damage to the system. The IC only restarts when the user cycles the mains power supply. With the low power internal structure, operating at a fixed 60 or 100 kHz, the controller supplies itself from the high−voltage rail, avoiding the need of an auxiliary winding. This feature naturally eases the designer’s task in battery charger applications. Finally, current−mode control provides an excellent audio−susceptibility and inherent pulse−by−pulse control. www.DataSheet4U.com When the load current falls 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 skip mode is designed to operate at relatively lower peak current so that acoustic noise that commonly takes place will not happen with NCP1201. Features http://onsemi.com MARKING DIAGRAMS 8 8 1 SOIC−8 D SUFFIX CASE 751 1 8 PDIP−8 P SUFFIX CASE 626 1 1 1201Py0 AWL YYWWG 201Dx ALYW G 8 x y y xx A L Y, YY W, WW G or G = Device Code: 6 for 60 kHz 1 for 100 kHz = Device Code: 6 for 60 kHz 10 for 100 kHz = Assembly Location = Wafer Lot = Year = Work Week = Pb−Free Package • • • • • • • • • • • • • AC Line Brownout Detect Protection, BOK Function Latchoff Mode Fault Protection No Auxiliary Winding Operation Internal Output Short−Circuit Protection Extremely Low No−Load Standby Power Current−Mode with Skip−Cycle Capability Internal Overtemperature Shutdown Internal Leading Edge Blanking 250 mA Gate Peak Current Driving Capability Internally Fixed Switching Frequency at 60 or 100 kHz Built−in Frequency Jittering for EMI Reduction Direct Optocoupler Connection Pb−Free Packages are Available PIN CONNECTIONS BOK FB CS GND 1 2 3 4 (Top View) 8 7 6 5 HV NC VCC DRV ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 17 of this data sheet. Typical Applications • AC−DC Adapters • Offline Battery Chargers • Auxiliary Power Supplies (USB, Appliances, TVs, etc.) © Semiconductor Components Industries, LLC, 2006 1 February, 2006 − Rev. 4 Publication Order Number: NCP1201/D NCP1201 C3 R3 470 p 100 k 250 V 1.0 W * D2 U1 1 4 2 3 2 90X264 Vac 3 + C2 4.7 m 400 V + 4 NCP1201 Q1 MTD1N60E 5 6 1N4937 + C5 10 m + C6 10 m 8 1N5819 D1 T1 L1 470 mH 0.2 A 6.5 V, 600 mA L3 47 mH 1.0 A R1 195.7 k DF06S + − BR1 1 C1 4.7 m 400 V C7 1.0 n 250 VAC Y1 + C4 10 mF SFH6156−2 4 R2 4.3 k L2 470 mH 0.2 A * Please refer to the application information section. R4 2.7 0.5 W 1 2 3 U2 D3 5V1 Figure 1. Typical Application Example http://onsemi.com 2 NCP1201 Iref BOK 1 + − 50 mA 10.5 V/12.5 V FB 2 Oscillator 60 or 100 kHz Clock + + CS 3 − 1.92 V − 80 K 1.07 V Output Skip Cycle Comparator + − 24 K Output Set Maximum 83% Duty Cycle Enable 6 Q Reset + − + Output − + − HV Current Source 7 NC 8 HV VCC Reset Reset TSD Startup Blanking GND 4 20 k + − 57 k 25 k Vref 250 ns L.E.B. + − Output 5 250 mA Internal Regulator Vref DRV 0.9 V Overload Figure 2. Simplified Functional Block Diagram http://onsemi.com 3 NCP1201 ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á Á ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Á ÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ PIN FUNCTION DESCRIPTION Pin No. 1 2 Pin Name BOK FB Function Bulk OK Description This pin detects the input line voltage by sensing the bulk capacitor, and disables the PWM when line voltage is lower than normal. Sets the Peak Current Setpoint By connecting an optocoupler to this pin, the peak current setpoint is adjusted according to the output power demand. Internal monitoring of this pin level triggers the fault management circuitry. This pin senses the primary inductor current and routes it to the internal comparator via an LEB circuit. − The driver’s output to an external MOSFET. This pin is connected to an external bulk capacitor of typically 10 mF. This unconnected pin ensures adequate creepage distance between High Voltage pin to other pins. Connected to the high−voltage rail, this pin injects a constant current into the VCC capacitor. 3 4 5 6 7 8 CS GND DRV VCC NC HV Current Sense Input The IC Ground Driving Pulses Supplies the IC No Connection Generates the VCC from the Line MAXIMUM RATINGS (TJ = 25°C unless otherwise noted) Rating Power Supply Voltage, Pin 6 Input/Output Pins Pins 1, 2, 3, 5 Symbol VCC VIO Value Unit V V V −0.3, 16 −0.3, 6.5 500 100 178 Maximum Voltage on Pin 8 (HV) Thermal Resistance, Junction−to−Air, PDIP−8 Version Thermal Resistance, Junction−to−Air, SOIC Version Operating Junction Temperature Range Operating Ambient Temperature Range Storage Temperature Range ESD Capability, HBM (All pins except VCC and HV pins) (Note 1) ESD Capability, Machine Model (All pins except VCC and HV pins) (Note 1) VHV RqJA RqJA TJ TA Tstg − − °C/W °C/W °C °C °C kV V −40 to +150 −25 to +125 −55 to +150 2.0 200 Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected. 1. This device series contains ESD protection and exceeds the following tests: Human Body Model (HBM) > 2.0 kV per JEDEC standard: JESD22−A114. Machine Model (MM) > 200 V per JEDEC standard: JESD22−A115. 2. Latchup Current Maximum Rating: ±150 mA per JEDEC standard: JESD78. http://onsemi.com 4 NCP1201 ELECTRICAL CHARACTERISTICS (For typical values TJ = 25°C, for min/max values TJ = −25°C to +125°C, VCC = 11 V unless otherwise noted) Characteristic DYNAMIC SELF−SUPPLY VCC Increasing Level at which the Current Source Turns−Off VCC Decreasing Level at which the Current Source Turns−On Internal IC Current Consumption, No Output Load on Pin 5 Internal IC Current Consumption, 1.0 nF Output Load on Pin 5 NCP1201P60, NCP1201D60 NCP1201P100, NCP1201D100 Internal IC Current Consumption, Latchoff Phase INTERNAL STARTUP CURRENT SOURCE High−Voltage Current Source at VCCON – 0.2 V High−Voltage Current Source at VCC = 0 V HV Pin Leakage Current @ 450 V, VCC Pin Connected to Ground OUTPUT SECTION Output Voltage Rise−Time (CL = 1.0 nF, 10 V Output) Output Voltage Fall−Time (CL = 1.0 nF, 10 V Output) Source Resistance (VDRV = ) Sink Resistance (VDRV = ) CURRENT SENSE SECTION (Pin 5 Unloaded) Input Bias Current @ 1.0 V Input Level on Pin 3 Maximum Current Sense Input Threshold Default Current Sense Threshold for Skip Cycle Operation Propagation Delay from Current Detection to Gate OFF State Leading Edge Blanking Duration OSCILLATOR SECTION (VCC = 11 V, Pin 5 Loaded by 1.0 KW) Oscillation Frequency NCP1201P60, NCP1201D60 NCP1201P100, NCP1201D100 Built−in Frequency Jittering (as a function of Vcc voltage) NCP1201P60, NCP1201D60 NCP1201P100, NCP1201D100 Maximum Duty Cycle FEEDBACK SECTION (VCC = 11 V, Pin 5 Unloaded) Internal Pullup Resistor Feedback Pin to Pin 3 Current Setpoint Division Ratio BROWNOUT DETECT SECTION BOK Input Threshold Voltage BOK Input Bias Current (VBOK < Vth) Source Bias Current (Turn on After VBOK > Vth) FREQUENCY SKIP CYCLE SECTION Built−in Frequency Skip Cycle Comparator Voltage Threshold THERMAL SHUTDOWN Thermal Shutdown Trip Point, Temperature Rising (Note 3) Thermal Shutdown Hysteresis 3. Verified by design. TSD THYST − − 145 25 − − °C °C VSKIP 0.96 1.07 1.18 V Vth IIB−BOK ISC 1.75 − 40 1.92 11 50 2.05 100 58 V nA mA RUP Iratio 10 2.9 17 3.3 24 4.0 kW − Fjitter − − Dmax 74 493 822 83 − − 87 % FOSC 52 92 60 100 72 117 Hz/V kHz IIB−CS VILIMIT VILSKIP TDEL TLEB − 0.8 250 35 150 10 0.9 325 65 260 100 1.0 390 160 400 nA V mV ns ns Tr Tf ROH ROL − − 26 4.0 116 41 38 10 − − 60 22 ns ns W W IC1 IC2 ILEAK 3.6 7.5 − 5.3 11.1 30 7.1 15 70 mA mA mA VCCOFF VCCON ICC1 ICC2 0.75 1.6 ICC3 405 1.6 2.1 575 2.2 2.8 772 mA 11.5 9.6 440 12.5 10.5 905 13.5 11.3 1300 V V mA mA Symbol Min Typ Max Unit http://onsemi.com 5 NCP1201 TYPICAL CHARACTERISTICS VCCOFF, VCC OFF THRESHOLD VOLTAGE (V) VCCON, VCC ON THRESHOLD VOLTAGE (V) 12.9 12.7 12.5 12.3 12.1 11.9 11.7 −25 0 25 50 75 100 TJ, JUNCTION TEMPERATURE (°C) 125 10.8 10.6 10.4 10.2 10 9.8 −25 0 25 50 75 100 TJ, JUNCTION TEMPERATURE (°C) 125 Figure 3. VCC OFF Threshold Voltage vs. Junction Temperature Figure 4. VCC ON Threshold Voltage vs. Junction Temperature ICC2, CURRENT CONSUMPTION (mA) 1100 ICC1, CURRENT CONSUMPTION WITH NO LOAD (mA) 2.6 1 nF Load 2.4 2.2 2.0 1.8 1.6 1.4 −25 0 25 50 75 100 TJ, JUNCTION TEMPERATURE (°C) 125 60 KHz 1000 900 100 K