ncv8871 ON Semiconductor, ncv8871 Datasheet
ncv8871
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ncv8871 Summary of contents
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... NCV8871 Automotive Grade Non-Synchronous Boost Controller The NCV8871 is an adjustable output non−synchronous boost controller which drives an external N−channel MOSFET. The device uses peak current mode control with internal slope compensation. The IC incorporates an internal regulator that supplies charge to the gate driver. ...
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EN/ EN/SYNC OSC 1 SYNC Figure 1. Simplified Block Diagram and Application Schematic PACKAGE PIN DESCRIPTIONS Pin Symbol Pin No. 1 EN/SYNC Enable and synchronization input. The falling edge synchronizes the internal oscillator. ...
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... VIN pin is required if bootstrapping VDRV and VIN off of the output voltage. PACKAGE CAPABILITIES Characteristic ESD Capability (All Pins) Moisture Sensitivity Level Package Thermal Resistance Device Variations The NCV8871 features several variants to better fit a multitude of applications. The table below shows the typical TYPICAL VALUES Part No max ...
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... REF NCV887100 NCV887101 NCV887102 NCV887103 From EN → 1 until start of switching with NCV887100 a NCV887101 NCV887102 NCV887103 EN/SYNC s,ih s,il From SYNC falling edge, to oscillator con- en trol (EN high) or shutdown (EN low), Per- cent of typical switching period Percent From SYNC falling edge to GDRV falling ...
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... DRV DRV V − drv IN DRV V − d,bd DRV IN d, 0.1 − DRV VDRV NCV887100 NCV887101 NCV887102 NCV887103 V falling uvlo IN V rising IN From start of soft−start, Percent of t From shutdown to start of soft−start, Percent percent of V scp FB ref From V < ...
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TYPICAL PERFORMANCE CHARACTERISTICS 25° INPUT VOLTAGE (V) IN Figure 2. Sleep Current vs. Input Voltage 4.5 4.0 3.5 3.0 2.5 2.0 − ...
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TYPICAL PERFORMANCE CHARACTERISTICS 1.205 1.203 1.201 1.199 1.197 1.195 − JUNCTION TEMPERATURE (°C) J Figure 8. Reference Voltage vs. Temperature 8.0 7.5 7.0 6.5 6.0 5.5 5.0 − 25° ...
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... EN/SYNC The Enable/Synchronization pin has three modes. When a dc logic high (CMOS/TTL compatible) voltage is applied to this pin the NCV8871 operates at the programmed frequency. When a dc logic low voltage is applied to this pin the NCV8871 enters a low quiescent current sleep mode. When a square wave of at least %f switching frequency is applied to this pin, the switcher operates at the same frequency as the square wave ...
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... Internal Soft−Start To insure moderate inrush current and reduce output overshoot, the NCV8871 features a soft start which charges a capacitor with a fixed current to ramp up the reference voltage. This fixed current is based on the switching frequency, so that if the NCV8871 is synchronized to twice the default switching frequency the soft start will last half as long. ...
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... The total feedback resistance (R the range – 100 kW. 7. Select Compensator Components Current Mode control method employed by the NCV8871 allows the use of a simple, Type II compensation to optimize the dynamic response according to system requirements. 8. Select MOSFET(s) In order to ensure the gate drive voltage does not drop out ...
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... D G 1.27 BSC 0.050 BSC H 0.10 0.25 0.004 0.010 J 0.19 0.25 0.007 0.010 J K 0.40 1.27 0.016 0.050 0.25 0.50 0.010 0.020 S 5.80 6.20 0.228 0.244 mm inches ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative NCV8871/D _ ...