ncp1395 ON Semiconductor, ncp1395 Datasheet
ncp1395
Available stocks
Related parts for ncp1395
ncp1395 Summary of contents
Page 1
... NCP1395A/B High Performance Resonant Mode Controller The NCP1395A/B offers everything needed to build a reliable and rugged resonant mode power supply. Its unique architecture includes a 1.0 MHz Voltage Controller Oscillator whose control mode brings flexibility when an ORing function is a necessity, e.g. in multiple feedback paths implementations. Protections featuring various reaction times, e.g. immediate shutdown or timer− ...
Page 2
... NCP1395A/B Figure 1. Typical Application Example http://onsemi.com 2 ...
Page 3
... Slow Fault Detection 15 OUT OPAMP Output 16 NINV OPAMP Noninverting NCP1395A/B Description Connecting a resistor to this pin, sets the minimum oscillator frequency reached for VFB is below 1 resistor sets the maximum frequency excursion. A simple resistor adjusts the deadtime length. Select the soft−start duration. ...
Page 4
... If FAULT Itimer else 0 + Timer − + Vref Vdd ISS SS FB RFB − Vfb_fault IDT DT Vdd IBO + BO − + VBO AGND NCP1395A Clk Q − 50 Adj Reset on A Version Only Timeout Fault PON Reset Fault + > 0 only − V(FB) > Vfb_off Vdd ...
Page 5
... This device series contains ESD protection and exceeds the following tests: Human Body Model 2000 V per Mil−Std−883, Method 3015 Machine Model Method 200 V. 2. This device contains latch−up protection and exceeds 100 mA per JEDEC Standard JESD78. NCP1395A/B Symbol V CC − ...
Page 6
... Maximum Deadtime with R = 540 kW from Pin 3 to GND DT Minimum Deadtime from Pin 3 to GND DT 3. Room temperature only, please look at characterization data for evolution versus junction temperature. NCP1395A/B = 25°C, for min/max values T = 0°C to +125°C, Max Pin Symbol ...
Page 7
... The A version does not activate soft−start when the fast−fault is released, this is for skip cycle implementation. The B version does activate the soft−start upon release of the fast−fault input. 5. Minimum current occurs 0°C. J NCP1395A/B = 25°C, for min/max values Pin ...
Page 8
... TEMPERATURE (°C) Figure 3. VCCon A 50 49.5 49 48.5 48 −40 − TEMPERATURE (°C) Figure 5. Fsw min −40 − TEMPERATURE (°C) Figure 8. Pulldown Resistor (RFB) NCP1395A/B 10 9.8 9.6 9.4 9.2 9.0 80 100 120 140 −40 −20 1.1 1.0 0.9 0.8 0.7 80 100 120 140 −40 −20 2.70 2.65 2.60 2.55 2.50 80 100 ...
Page 9
... TEMPERATURE (°C) Figure 11. T_dead_min A 1300 1200 1100 1000 900 800 700 −40 − TEMPERATURE (°C) Figure 14. T_dead_max A NCP1395A/B 110 100 100 120 140 −40 −20 350 340 330 320 310 300 80 100 ...
Page 10
... TYPICAL CHARACTERISTICS − A VERSION 1.04 1.035 1.03 1.025 1.02 −40 − TEMPERATURE (°C) Figure 15. Brown−Out Reference (VBO) 4.2 4.15 4.1 4.05 4.0 −40 NCP1395A 100 120 140 −40 −20 Figure 16. Brown−Out Hysteresis Current (IBO) − 100 TEMPERATURE (°C) Figure 17. Latch Level (Vlatch) http://onsemi ...
Page 11
... TEMPERATURE (°C) Figure 18. VCCon B 50 49.5 49 48.5 48 −40 − TEMPERATURE (°C) Figure 20. Fsw min −40 − TEMPERATURE (°C) Figure 23. Pulldown Resistor (RFB) NCP1395A/B 10 9.8 9.6 9.4 9.2 9.0 80 100 120 140 −40 −20 1.1 1.0 0.9 0.8 0.7 80 100 120 140 −40 −20 2.70 2.65 2.60 2.55 2.50 80 100 ...
Page 12
... TEMPERATURE (°C) Figure 26. T_dead_min B 1300 1200 1100 1000 900 800 700 −40 − TEMPERATURE (°C) Figure 29. T_dead_max B NCP1395A/B 110 100 100 120 140 −40 −20 350 340 330 320 310 300 80 100 ...
Page 13
... TYPICAL CHARACTERISTICS − B VERSION 1.04 1.035 1.03 1.025 1.02 −40 − TEMPERATURE (°C) Figure 30. Brown−Out Reference (VBO) 4.2 4.15 4.1 4.05 4.0 −40 NCP1395A 100 120 140 −40 −20 Figure 31. Brown−Out Hysteresis Current (IBO) − 100 TEMPERATURE (°C) Figure 32. Latch Level (Vlatch) http://onsemi ...
Page 14
... Skip Cycle Possibility: The absence of soft−start on the NCP1395A fast fault input offers an easy way to implement skip cycle when power saving features are necessary. A simple resistive connection from the feedback pin to the fast fault input, and skip can be implemented. • ...
Page 15
... Vcc Rt−max sets the maximum Fsw FB Rfb 20 k NCP1395A/B more recommended for industrial/medical applications where auxiliary supply directly powers the chip. 2. The A version does not activate the soft−start upon release of the fast fault input. This is to let the designer implement skip cycle. To the opposite, the B version goes back to operation upon the fast fault pin release via a soft− ...
Page 16
... V and 6 take the external excursion numbers, 1 kHz, 6 1.0 MHz, then the VCO 1 Meg− 202 kHz V. slope will then be 4.7 NCP1395A/B Figures 35 and 36 portray the frequency evolution depending on the feedback pin voltage level in a different frequency clamp combination A&B A& ...
Page 17
... Figure 37. Maximum switching frequency resistor selection depending on the adopted minimum switching frequency. 200 180 160 140 120 100 RFmin (kW) Figure 38. Minimum Switching Frequency Resistor Selection NCP1395A/B 1100 1000 900 800 700 600 300 ns 500 400 300 200 ...
Page 18
... Soft−Start Sequence In resonant controllers, a soft−start is needed to avoid suddenly applying the full current into the resonating NCP1395A/B hence the ability to adjust it on this controller. The option ranges between 150 ns and 1.0 ms. The deadtime is actually made by controlling the oscillator discharge current. ...
Page 19
... The fast fault input undergoes a special treatment. Since we want to implement skip cycle through the fast fault input on the NCP1395A, we cannot activate the soft−start every time the feedback pin stops the operations in low power mode. Therefore, when the fast fault pin is released, ...
Page 20
... Rlower + VBO Figure 45. The Internal Brown−Out Configuration with an Offset Current Source NCP1395A/B 65.9u 75.7u time in seconds Figure 44. Typical Oscillator Waveforms (HV) rail. A resistive divider made of Rupper and Rlower, brings a portion of the HV rail on pin 7. Below the turn−on level, a current source IBO is off. Therefore, the turn−on level solely depends on the division ratio brought by the resistive divider ...
Page 21
... To the contrary, when the internal BO signal is high (A and B pulse), the IBO source is activated and creates a hysteresis. The hysteresis level actually depends on the circuit: NCP1395A features whereas the NCP1395B uses current. Changes are IBO is off IBO is on V()) + Vbulk2 We can now extract Rlower from Equation 1 and plug it into Equation 2, then solve for Rupper: Vbulk1− ...
Page 22
... Reset DRIVING LOGIC Figure 48. This Circuit Combines a Slow and Fast Input for Improved Protection Features NCP1395A/B during fault time (please see above for details). The B version restarts with a soft−start sequence. • Slow events input: This input serves as a delayed shutdown, where an event like a transient overload does not immediately stopped pulses but start a timer ...
Page 23
... Vout goes up again and so on: we are in skip cycle mode. NCP1395A/B reaches the VtimerON level (4.0 V typical), then all pulses are stopped. Itimer turns off and the capacitor slowly discharges to ground via a resistor installed in parallel with it ...
Page 24
... CC its stability during the hiccup. A similar situation can arise if the user selects a more traditional startup method, with an auxiliary winding. In that case, the VCC comparator stops the output pulses whenever it is activated, NCP1395A/B Vcc from an auxiliary supply Vcc from an auxiliary supply T T Fault! ...
Page 25
... the startup voltage. voltage. To the opposite, for applications where the ON resonant controller is powered from a standby power supply, the startup level of the NCP1395B typically allows a direct a connection from source. Simple ON/OFF operation is therefore feasible. Package PDIP−16 (Pb−Free) SOIC− ...
Page 26
... M −A− −B− −T− SEATING PLANE 0.25 (0.010 NCP1395A/B PACKAGE DIMENSIONS PDIP−16 P SUFFIX CASE 648−08 ISSUE T L SEATING −T− PLANE SO−16 D SUFFIX CASE 751B−05 ISSUE ...
Page 27
... 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 27 ON Semiconductor Website: http://onsemi.com Order Literature: http://www.onsemi.com/litorder For additional information, please contact your local Sales Representative. NCP1395/D ...