NCP5173 ON Semiconductor, NCP5173 Datasheet
NCP5173
Related parts for NCP5173
NCP5173 Summary of contents
Page 1
... NCP5173 1.5 A 560 kHz−1.0 MHz Boost Regulator The NCP5173 is a switching regulator with a high efficiency, 1.5 A integrated switch. It runs at a base frequency of 560 kHz and can be synchronized to an external clock up to 1.0 MHz. This part operates over a wide input voltage range, from 2 The flexibility of ...
Page 2
... C. *The maximum package power dissipation must be observed. MAXIMUM RATINGS Pin Name Pin Symbol IC Power Input Shutdown/Sync Loop Compensation Voltage Feedback Input Test Pin Power Ground Analog Ground Switch Input NCP5173 R2 3. PGND FB ...
Page 3
... Power Switch Switch Saturation Voltage Switch Current Limit Minimum Pulse Width DI / DIV CC SW Switch Leakage 2. Guaranteed by design, not 100% tested in production. NCP5173 < < T < 125 C; for all specifications unless otherwise stated Test Conditions V tied to FB; measure ...
Page 4
... V High current switch pin. This pin connects internally to the collector of the power switch. The open SW voltage across the power switch can be as high minimize radiation, use a trace as short as practical. NCP5173 (continued) (2.7 V < V < < Test Conditions ...
Page 5
... V CC Shutdown 2.0 V Regulator Delay Timer Sync SS 0.4 V Detector − Positive Error Amp 1.276 V AGND NCP5173 Thermal Shutdown S PWM Oscillator Q Latch R Frequency Shift 5:1 Slope Compensation PWM Comparator + − Figure 2. Block Diagram http://onsemi.com Switch Driver PGND Ramp Summer ...
Page 6
... I (mA) SW Figure 5. V vs. I CE(SAT) 570 565 560 555 550 545 540 535 530 525 520 0 50 Temperature ( C) Figure 7. Switching Frequency vs. Temperature NCP5173 2 100 Figure 4. DI 1.9 − ...
Page 7
... 2.20 0 Temperature ( C) Figure 11. Current Limit vs. Temperature 1.7 V High Clamp Voltage C 1.5 1.3 1.1 V Threshold 0 Temperature ( C) Figure 13. V Threshold and High Clamp C Voltage vs. Temperature NCP5173 0. 0.18 0.16 0.14 0. 0.10 0.08 100 2 100 Figure 12. Maximum Duty Cycle vs. Temperature 1 ...
Page 8
... V (V) IN Figure 17. I vs. V During Shutdown CC IN 100 60 20 −20 −60 −255 −175 −125 −75 V − V (mV) REF FB Figure 19. Error Amplifier I NCP5173 2 −10 100 600 −40 C 550 500 450 Figure 18. Error Amplifier Transconductance 2 ...
Page 9
... Without discrediting its apparent merits, current mode control comes with its own peculiar problems, mainly, subharmonic oscillation at duty cycles over 50%. The NCP5173 solves this problem by adopting a slope compensation scheme in which a fixed ramp generated by the oscillator is added to the current ramp. A proper slope rate is provided to improve circuit stability without sacrificing the advantages of current mode control ...
Page 10
... NCP5173 output through the inductor and diode. Once V approximately 1.5 V, the internal power switch briefly turns on. This is a part of the NCP5173’s normal operation. The turn−on of the power switch accounts for the initial current swing. When the V ...
Page 11
... SW the maximum output voltage plus the output diode forward voltage. The diode forward voltage is typically 0.5 V for Schottky diodes and 0.8 V for ultrafast recovery diodes: V SW(MAX OUT(MAX NCP5173 where output diode forward voltage the flyback topology, peak V ...
Page 12
... V as close as possible to the chip. Output Capacitor Selection Figure 29. Typical Output Voltage Ripple NCP5173 By examining the waveforms shown in Figure 29, we can see that the output voltage ripple comes from two major sources, namely capacitor ESR and the charging/ discharging of the output capacitor ...
Page 13
... In the NCP5173, slope compensation is added during the entire switch on−time, typically in the amount of 180 mA/ms. In some cases, SHM can rear its ugly head despite the presence of the onboard slope compensation ...
Page 14
... Soft−Start Through the addition of an external circuit, a soft−start function can be added to the NCP5173. Soft−start circuitry prevents the V pin from slamming high during startup, C thereby inhibiting the inductor current from rising at a high slope ...
Page 15
... JA For the NCP5173, q Once the designer has calculated T whether the IC can be used in an application is settled exceeds 150 C, the absolute maximum allowable junction temperature, the NCP5173 is not suitable for that application approaches 150 C, the designer should consider J possible means of reducing the junction temperature. ...
Page 16
... Figure 36. Additional Application Diagram, 4.0 V Input, 100 Output Boost Converter with NCP5173 P6KE−15A V (5) CC 1N4148 PGND (7) V (8) SW AGND (6) NCP5173 ( ( NCP5173 V (8) SW AGND (6) FB (2) PGND ( 1N4148 1N4148 1N4148 ...
Page 17
... LOCATION 0. TOP VIEW 0. (A3) 0. SIDE VIEW BOTTOM VIEW NCP5173 PACKAGE DIMENSIONS 5x6 QFN MN SUFFIX CASE 505AC−01 ISSUE SEATING C PLANE NOTE 3 0. 0.05 C http://onsemi.com 17 NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14 ...
Page 18
... USA/Canada Japan: ON Semiconductor, Japan Customer Focus Center 2−9−1 Kamimeguro, Meguro−ku, Tokyo, Japan 153−0051 Phone: 81−3−5773−3850 http://onsemi.com 18 ON Semiconductor Website: http://onsemi.com Order Literature: http://www.onsemi.com/litorder For additional information, please contact your local Sales Representative. NCP5173/D ...