NCP1219 ONSEMI [ON Semiconductor], NCP1219 Datasheet
NCP1219
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NCP1219 Summary of contents
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... PWM Controller with Adjustable Skip Level and External Latch Input The NCP1219 represents a new, pin to pin compatible, generation of the successful 7−pin current mode NCP12XX product series. The controller allows for excellent standby power consumption by use of its adjustable skip mode and integrated high voltage startup FET. ...
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... EMI AC Filter Input latch input* * Optional Figure 1. Typical Application Circuit HV Skip/latch GND DRV NCP1219 R * ramp http://onsemi.com 2 + Output Voltage − ...
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upper 42.0k* Skip/latch R lower R 51.3k* skip V FB(open) 16.7k ramp(peak ramp R V ramp GND * Typical ...
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Table 1. PIN FUNCTION DESCRIPTION Pin Name 1 Skip/latch This pin provides a latch input to permanently disable the device under a fault condition. It also allows the user to adjust the skip threshold. A resistor between this pin and ...
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Table 2. MAXIMUM RATINGS (Notes 1 − Voltage HV Current Supply Voltage Supply Current Skip/latch Voltage Skip/latch Current FB Voltage FB Current CS Voltage CS Current DRV Voltage DRV Current Operating Junction Temperature Storage Temperature Range Power Dissipation ...
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Table 3. ELECTRICAL CHARACTERISTICS 0.1 mF, for typical values T = 25°C, for min/max values Characteristics STARTUP AND SUPPLY CIRCUITS Supply Voltage Startup Threshold Minimum Operating Voltage Undervoltage Lockout Double Hiccup Threshold Logic Reset Voltage UVLO Filter Delay ...
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Table 3. ELECTRICAL CHARACTERISTICS 0.1 mF, for typical values T = 25°C, for min/max values Characteristics GATE DRIVE Drive Resistance DRV Sink DRV Source Rise Time (10% to 90%) Fall Time (90% to 10%) LATCH INPUT Latch Voltage ...
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V 12 CC(on CC(MIN UVLO CC(reset −50 − JUNCTION TEMPERATURE (°C) J Figure 3. Supply Voltage Thresholds vs. Junction Temperature 300 280 ...
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−40° 125° 150 225 300 VOLTAGE (V) HV Figure 9. Startup Circuit Leakage ...
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Option 100 kHz Option −50 − JUNCTION TEMPERATURE (°C) J Figure 15. Oscillator Frequency vs. Junction Temperature ...
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T , JUNCTION TEMPERATURE (°C) J Figure 21. Adjustable Skip Threshold vs. Junction Temperature ...
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... The NCP1219 is part of a product family of current mode controllers designed for ac−dc applications requiring low standby power. The controller operates in skip or burst mode at light load. Its high integration reduces component count resulting in a more compact and lower cost power supply. This device family has 2 options, A and B. Option A latches where as option B auto restarts after an overload fault ...
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... It is recommended that an external filter capacitor be placed as close as possible to the V noise immunity. Soft−Start Operation Figures 28 and 29 show how the soft−start feature is included comparator. When the NCP1219 starts up, a soft−start voltage V gradually from 1 4.8 ms and stays at 1.0 V afterward. V feedback pin voltage (V (V ...
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... Current−Mode Pulse Width Modulation The NCP1219 is a current−mode, fixed frequency pulse width modulation controller with ramp compensation. The PWM block of the NCP1219 is shown in Figure 30. The DRV signal is enabled by a clock pulse. At this time, current begins to flow in the power MOSFET and the sense resistor ...
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... R clock signal that sets the DRV signal high and limits the ramp duty ratio to 80% (typical). The oscillator has a fixed frequency of 65 kHz or 100 kHz. The NCP1219 employs R CS frequency jittering to smooth the EMI signature of the system by spreading the energy of the main switching component across a range of frequencies ...
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... Figure 34. Oscillator Frequency Modulation Gate Drive The output drive of the NCP1219 is designed to directly drive the gate of an n−channel power MOSFET. The DRV pin is capable of sourcing 500 mA and sinking 800 mA of drive current. It has typical rise and fall times and 20 ns, respectively, driving capacitive load ...
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... At this point, a significant portion of the power dissipation is related to the power MOSFET switching on and off. To reduce this power dissipation, the NCP1219 “skips” pulses when the FB level drops below the skip threshold. The level at which this occurs is completely adjustable by setting a resistor on the Skip/latch pin ...
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... V skip/latch 9.5 V (maximum pin voltage) Controller is latched V latch Skip threshold clamped to V skip(MAX) V (maximum skip threshold) skip(MAX) Adjustable V range. skip 0 V (no skip) Figure 39. NCP1219 VSkip/latch Pin Operating Regions Table 4. %I and Skip Threshold Relationship with R CSskip %ICS V skip Skip/latch 12% 0.36 V 25% ...
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... NCP1219AD100R2G Latch †For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. The NCP1219 also has an internal temperature shutdown double hiccup circuit. If the junction temperature of the controller reaches CC 155°C (typical), the driver turns off and the controller enters double hiccup mode. Latched and Auto− ...
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... The products described herein (NCP1219) may be covered by one or more of the following U.S. patents: 6,271,735, 6,362,067, 6,385,060, 6,597,221, 6,633,193, 6,587,351, 6,940,320. There may be other patents pending. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein ...