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NCP1212DR2G Datasheet(PDF) 4 Page - ON Semiconductor |
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NCP1212DR2G Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 22 page NCP1212 http://onsemi.com 4 PIN FUNCTION DESCRIPTION Pin Name Function Description 1 FB Feedback Input This pin detects voltage feedback from output, can be connected directly to the optocoupler collector pin. 2 BOK Brownout Detect with Hysteresis This is the inverting input of the brownout detect comparator. The brownout detect comparator has a detect threshold voltage of 1.21 V. This pin senses the voltage of the bulk capacitor through a resistor divider network to determine the brownout event. The hysteresis band is provided by a 45 mA current flows out of this pin to the resistor network. 3 CS Current Sense Input During output on–time of the power switch, this pin receives a voltage proportional to power switch current set by the current sensing resistor. The information is utilized to terminate output switch conduction by PWM action or overcurrent limit circuitry. 4 CT Programmed Oscillator Frequency Connecting a capacitor from CT pin to ground programs the internal oscillator frequency. The oscillator can operate up to 200 kHz. 5 GND IC Ground − 6 DRV Gate Driver Output This is a high current totem pole output. The PWM driving control is provided by this pin. The current and slew rate capability of this pin are suitable to drive a Power MOSFET. 7 VCC Positive Supply to IC This pin is the positive supply of the IC. The driver output gets disabled when the voltage becomes higher than 25 V and the operating range is between 10 V and 25 V. The startup voltage is set at 15 V. 8 SS/DMAX Soft−Start Time Programming and Maximum Duty Cycle Selection This is a multi−function pin. Soft−start effect is provided during startup with a capacitor connected to this pin. After soft−start period elapsed, the capacitor is used for timing control to determine output overload. If only a capacitor is connected to this pin, its final voltage is X4.3 V and maximum turn−on duty cycle DMAX is set at 82%. Connect a resistor in parallel with the capacitor can alter the final voltage of this pin. 48% DMAX is selected if this pin stays at 2.1 V to 2.8 V after soft−start period. MAXIMUM RATINGS (TJ = 25°C unless otherwise noted.) Rating Symbol Value Unit Power Supply Voltage (Pin 7) VCC −0.3, 28 V Input/Output Pins (Pins 1, 2, 3, 4, 8) VIO −0.3, 6.5 V Gate Driver Output Pin (Pin 6) VDRV −0.3, 14 V Power Dissipation and Thermal Characteristics Thermal Resistance, Junction−to−Air, PDIP−8 Version Thermal Resistance, Junction−to−Air, SOIC−8 Version RqJ−A 100 178 °C/W Output Current, Source or Sink IDRV 1.0 A Operating Junction Temperature Range TJ −40 to +150 °C Operating Ambient Temperature Range TA −25 to +105 °C Storage Temperature Range Tstg −55 to +150 °C ESD Capability, HBM (All pins except VCC pin) (Note 1) − 2.0 kV ESD Capability, Machine Model (All pins except VCC pin) (Note 1) − 200 V 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) v2.0 kV per JEDEC standard: JESD22−A114. Machine Model (MM) v200 V per JEDEC standard: JESD22−A115. 2. Latchup Current Maximum Rating: "150 mA per JEDEC standard: JESD78. |
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