NCP1015 ON Semiconductor, NCP1015 Datasheet
NCP1015
Available stocks
Related parts for NCP1015
NCP1015 Summary of contents
Page 1
... Dynamic Self-Supply (no need for an auxiliary winding). Unlike other monolithic solutions, the NCP1015 is quiet by nature: during nominal load operation, the part switches at one of the available frequencies (65-100 kHz). When the current set-point falls below a given value, e ...
Page 2
... Indicative Maximum Output Power from NCP1015 DS(on 450 mA DSS 450 mA Auxiliary Winding 1. Informative values only, with 50°C, circuit mounted on minimum copper area as recommended. amb 100-250 Vac PIN FUNCTION DESCRIPTION Pin No. SOT-223 PDIP-7 Pin Name GND ...
Page 3
... ESD Capability, Machine Model (MM) Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. NCP1015 Drain High when V ...
Page 4
... SKIP CYCLE GENERATION V Default skip mode level on FB pin skip TEMPERATURE MANAGEMENT TSD Temperature shutdown Hysteresis in shutdown 2. See characterization curves for temperature evolution NCP1015 (For typical values T = 25°C, for min/max values T J Rating CC(off Vds set for Ids = 0.7 x Ids ) L ...
Page 5
... TEMPERATURE (°C) Figure 3. IC1 @ vs. Temperature 0.40 0.38 0.36 0.34 0.32 0.30 0.28 0.26 0.24 0.22 0.20 - TEMPERATURE (°C) Figure 5. ICC2 @ Open CC vs. Temperature NCP1015 TYPICAL CHARACTERISTICS 1.50 1.40 1.30 1.20 1.10 1.00 0.90 0.80 0.70 0.60 0.50 75 100 125 -25 0 Figure 4. ICC1 @ V 9.00 8.90 8.80 8.70 8.60 8.50 8.40 8.30 8.20 - 100 125 Figure 6. V http://onsemi.com 100 125 TEMPERATURE (° ...
Page 6
... Figure 9. Ipeak-RR, V 150 130 110 100 kHz kHz 50 - TEMPERATURE (°C) Figure 10. Frequency vs. Temperature NCP1015 TYPICAL CHARACTERISTICS 100 125 -25 0 Figure 8. Duty Cycle vs. Temperature 100 TEMPERATURE (° ...
Page 7
... W universal power supply. • No acoustic noise while operating: Instead of skipping cycles at high peak currents, the NCP1015 waits until the peak current demand falls below a fixed 0.25 of the maximum limit result, cycle skipping can take place without having a singing transformer. You can thus select cheap magnetic components free of noise problems ...
Page 8
... If the error flag is low (peak limit not active) then CC(on) the IC works normally. If the error signal is active, then the NCP1015 immediately stops the output pulses, reduces its internal current consumption and does not allow the startup source to activate: V drops toward ground until it reaches ...
Page 9
... Tstart Figure 15. NCP1015 Facing a Fault Condition (V The rising slope from the latch-off level expressed by ICC1 P DSS in + DV1 @ C t start IC1 The time during which the IC actually pulses is given by: + DV2 @ ICC1 Finally, the latch-off time can be derived using the same ...
Page 10
... R when entering standby. Otherwise the DSS could reactivate and the standby performance would degrade. We are thus able to bound R between two equations: limit NCP1015 V nom (eq. 9) Where: equals in V ...
Page 11
... V CC(off) V CC(on) Figure 17. A Detailed View of the NCP1015 with Properly Connected Auxiliary Winding Figure 18. The Burst Frequency becomes So Low that it is Difficult to Lowering the Standby Power with Skip-cycle Skip cycle offers an efficient way to reduce the standby power by skipping unwanted cycles at light loads. However, ...
Page 12
... This offers 62.4 kHz VCC Figure 20. The V Ripple Causes the Frequency Jittering on the Internal Oscillator Saw-tooth CC NCP1015 100% Peak current at nominal power 25% the benefit to artificially reduce the measurement noise on a standard EMI receiver and pass the tests more easily. The EMI sweep is implemented by routing the V (induced by the DSS activity) to the internal oscillator ...
Page 13
... Soft-Start The NCP1015 features an internal 1 ms soft-start activated during the power on sequence (P V reaches V , the peak current is gradually CC CC(off) increased from nearly zero up to the maximum internal clamping level (e.g. 350 mA). This situation lasts 1 ms and further to that time period, the peak current limit is blocked to the maximum until the supply enters regulation ...
Page 14
... MMBT2907 for the discrete latch. The NST3946 features two bipolar NPN + PNP in the same package and could also be used. Power Dissipation and Heatsinking The power dissipation of NCP1015 consists of the dissipation DSS current-source (when active) and the dissipation of MOSFET. Thus P tot When the PDIP7 package is surrounded by copper, it ...
Page 15
... N the turn ratio, V voltage, V the secondary diode forward drop and f finally, I the maximum peak current. Worse case p occurs when the SMPS is very close to regulation, NCP1015 > 1.011M 1.018M 1.025M e.g. the V pushed to the maximum. Taking into account all previous remarks, it becomes ...
Page 16
... If we stick to Equation 23, compute Lp and follow the above calculations, we will discover that a power supply built with the NCP1015 and operating from a 100 Vac line minimum will not be able to deliver more than 7 W continuous, regardless of the selected switching frequency (however the transformer core size will go down as f increased) ...
Page 17
... ms. Select the zener or TVS clamping level between volts above the reflected output voltage when the supply is heavily loaded. http://onsemi.com CVc NCP1015 C and V are maximum p in ...
Page 18
... Typical Application Examples A 6.5 W NCP1015-based Flyback converter. (For evaluation a universal NCP1012 demo-board can be used) Figure 27 shows a converter originally built with a NCP1012 which can be easily used for evaluation of NCP1015 device delivering 6.5 W from a universal volts D1 D2 1N4007 1N4007 CEE7.5/2 ...
Page 19
... A 7.0 W NCP1015-based Flyback Converter Featuring Low Standby Power Figure 29 shows another typical application showing a NCP1015-65 kHz operating converter up to 70°C of ambient temperature. We can grow-up the output power since an auxiliary winding is used, the DSS is disabled, and Vbulk 1N4148 D4 + C10 33 mF/ ...
Page 20
... NCP1015AP065G 65 NCP1015AP100G 100 NCP1015ST65T3G 65 NCP1015ST100T3G 100 †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. NCP1015 Package Type Shipping PDIP-7 (Pb-Free) 50 Units / Rail PDIP-7 (Pb-Free) SOT-223 (Pb-Free) 4000 / Tape & Reel ...
Page 21
... NOTE 3 C -T- N SEATING PLANE 0.13 (0.005) M NCP1015 PACKAGE DIMENSIONS PDIP-7 AP SUFFIX CASE 626A-01 ISSUE http://onsemi.com 21 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. PACKAGE CONTOUR OPTIONAL (ROUND OR SQUARE CORNERS). ...
Page 22
... ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. The product described herein (NCP1015) may be covered by one or more of the following U.S. patents: 6,271,735, 6,385,060. There may be other patents pending. SENSEFET is a trademark of Semiconductor Components Industries, LLC (SCILLC). ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) ...