NCP1587E ON Semiconductor, NCP1587E Datasheet
NCP1587E
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NCP1587E Summary of contents
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... V. This 8−pin device provides an optimal level of integration to reduce size and cost of the power supply. The NCP1587E provides gate driver design and an internally set 275 kHz oscillator. In addition to the 1 A gate drive capability, other efficiency enhancing features of the gate driver include adaptive non− ...
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0 REF COMP/DIS 7 www.DataSheet4U.com BST FB COMP/DIS TG PHASE BG GND Figure 1. Typical Application Diagram FAULT PWM - OUT S Clock Ramp OSC OSC ...
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... COMP/DISABLE MAXIMUM RATINGS Thermal Resistance, Junction−to−Ambient Thermal Resistance, Junction−to−Case NCP1587E Operating Junction Temperature Range NCP1587E Operating Ambient Temperature Range Storage Temperature Range Lead Temperature Soldering (10 sec): Reflow (SMD styles only) Pb−Free Moisture Sensitivity Level www.DataSheet4U.com Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied ...
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ELECTRICAL CHARACTERISTICS < PHASE < Characteristic Input Voltage Range Boost Voltage Range Supply Current Quiescent Supply Current Boost Quiescent Current Under Voltage Lockout UVLO Threshold UVLO Hysteresis Switching Regulator VFB Feedback ...
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TYPICAL CHARACTERISTICS 5.0 4.7 4.4 4.1 3.8 3 JUNCTION TEMPERATURE (°C) J Figure JUNCTION TEMPERATURE (°C) J Figure ...
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... General The NCP1587E is a PWM controller intended for DC−DC conversion from 5.0 V & buses. The device has internal gate driver circuit designed to drive N−channel MOSFETs in a synchronous−rectifier buck topology. The output voltage of the converter can be precisely regulated down to 800 mV ±1.0% when the V The switching frequency, is internally set to 275 kHz ...
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... Undervoltage Lockout (UVLO) is provided to ensure that unexpected behavior does not occur when V support the internal rails and power the converter. For the NCP1587E, the UVLO is set to permit operation when converting from a 5.0 input voltage. Overcurrent Threshold Setting NCP1587E can easily program an Overcurrent Threshold ranging from 550 mV, simply by adding a resistor (RSET) between BG and GND ...
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Input Capacitor Selection The input capacitor has to sustain the ripple current produced during the on time of the upper MOSFET must have a low ESR to minimize the losses. The RMS value of this ripple is: Iin ...
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... The pole of the compensation network is calculated as, V REF * V OUT REF R 1 100 Thermal Considerations The power dissipation of the NCP1587E varies with the MOSFETs used average MOSFET gate current typically dominates the + V ref control IC power dissipation. The IC power dissipation is − determined by the formula: Where: http://onsemi ...
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... IN OUT capacitors desirable to locate the NCP1587E within 1 inch of the MOSFETs, Q1 and Q2. The circuit traces for the MOSFETs’ gate and source connections from the NCP1587E must be sized to handle peak current BST DESIGN EXAMPLE I: Type II Compensation (Electrolytic Cap ...
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... Zeros of the compensation network are calculated as follows; 1st zero; Blue curve: Gain-Frequency Red curve: Gain-Frequency (Phase margin = 61.417 degree, Gain margin = 9.347 dB) Figure 13. Closed-loop Voltage Loop-gain of the NCP1587E , ...
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... kW kW 665 275 KHz C20 = 3 48. Blue curve: Gain-Frequency Red curve: Gain-Frequency (Phase margin = 80.285 degree, Gain margin = 19.362 dB) Figure 14. Closed-loop Voltage Loop-gain of the NCP1587E http://onsemi.com The recommended compensation values are; = 12 ...
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VCC GND 5 3 Figure 15. Demo Board PCB Layout http://onsemi.com 13 ...
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... BAS116LT1 CP J9 20PIN 2ROW J23 L1 L2 Q1,Q2 NTD4815 Q3,Q4 NTD4815 Q5,Q6 NTD4806 Q7,Q8 NTD4806 Q9,Q10,Q11,Q12 NTHS5404T1 Q37,Q38,Q39,Q40 R1 R2,R3 R4,RC1 R5 R6,R7,R639 R8 R9 R638 RC TP110,TP111,TP112 U1 NCP1587E http://onsemi.com 14 Value Quantity 1 PANASONIC 1500 mF DNP TAIYO YUDEN 0 1800 mF 2 PANASONIC DNP PANASONIC DNP 3 DNP 1 0 ...
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Figure 16. Gate Waveforms 20 A Load Sustaining Figure 18. Start-up Sequence www.DataSheet4U.com Figure 17. Over Current Protection (12 Trip) Figure 19. ...
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... N 0.25 0.50 0.010 S 5.80 6.20 0.228 1.52 0.060 4.0 0.155 1.270 0.050 mm SCALE 6:1 inches ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative INCHES MAX 0.197 0.157 0.069 0.020 0.050 BSC 0.010 0.010 0.050 0.020 0.244 NCP1587E/D ...