ncp5050 ON Semiconductor, ncp5050 Datasheet
ncp5050
Available stocks
Related parts for ncp5050
ncp5050 Summary of contents
Page 1
... The maximum peak current level of the power switch is adjustable to allow further system optimization. The NCP5050 is housed in a low profile space efficient 3x3 mm thermally enhanced WDFN. Features • ...
Page 2
... Figure 2. Typical Efficiency 2 4.7 mF 0603 6.3 V OSC Thermal 1.7MHz Shut down PCA 5 R1 PWM CONTROLLER 2.8k CTRL 3 Band Gap ENABLE 250k FLASH/TORCH Figure 3. Simplified Block Diagram NCP5050 LEDs out (7 350 mA 3 100 1000 I (mA) out 0805 25V 2 PVIN SW ...
Page 3
... The X5R low DC/C versus DC bias ceramic types are highly recommended. Switch: Power switch connection for inductor. Typical application will use a coil from 2 4 INPUT and must be capable of handling the peak current. NCP5050 Description notably for over voltage protection, this input must be out . out http://onsemi ...
Page 4
... Per IPC/JEDEC standard: J-STD-020A. 8. The maximum package power dissipation limit must not be exceeded. 125 * qJA NCP5050 Symbol P Vin V S ESD HBM ESD MM CTRL qJC ...
Page 5
... V per LED 11. The overall tolerance is dependent on the accuracy of the external resistor tolerance metal film resistor is recommended to achieve $20 % accuracy. I PEAK_MAX 12. With Schottky diode MBR130LSF and TDK VLF5014A-2R7M1R5 inductor. NCP5050 Minimum and Maximum Limits apply for T = +25°C and V A Symbol V in ...
Page 6
... I (mA) out Figure 8. Efficiency vs. Current @ 4 LEDs ( 350 mA TDK VLF5014A-2R7M1R5, (Notes 13 and 14) 13. Pulse of 500 ms every Flash Mode (Current following through HCS pin). 14. Efficiency = 100 x (Number of LED stacked x V NCP5050 1200 1000 800 600 400 200 0 2 Figure 5 ...
Page 7
... Channel 1: CTRL Pin, 5 V/Div, DC Measurement Channel 2: FB Pin, DC, 200 mV/Div Channel 3: Input Current, 200 mA/Div Channel 4: ILED, 50 mA/Div 1.0 ms/Div Figure 14. Low Frequency Dimming Control 250 Hz NCP5050 Channel 1:SW Pin DC Measurement, 5 V/Div Channel 4:LED Current DC Measurement, 200 mA/Div Figure 11. Continue Current Mode (CCM), ...
Page 8
... TYPICAL OPERATING CHARACTERISTICS 50.0 45.0 40.0 35.0 30.0 25.0 20.0 15.0 10.0 5.0 0 DUTY CYCLE (%) Figure 16. Dimming on CTRL kHz Duty Cycle R BF NCP5050 50.0 45.0 40.0 35.0 30.0 25.0 20.0 15.0 10.0 5.0 0 100 0 10 RMS vs. Figure 17. Dimming on CTRL: I OUT http://onsemi.com 8 Duty = 80% Duty = 50% Duty = 20 FREQUENCY (kHz) RMS vs. OUT = 5 W Frequency ...
Page 9
... SHOT OSC 1.7 MHz ENABLE Operation The NCP5050 DC-DC converter is based on a Current Mode PWM architecture which regulates the feedback voltage at 250 mV under normal operating conditions. The boost converter operates in two separate phases (See Figure 19). The first one is T when the inductor is charged ...
Page 10
... Figure 16). In other word by reducing the duty cycle the brightness of the LED is dimmed. The NCP5050 as been design to sustain high PWM dimming frequency kHz. Finally to avoid any optical flicker the frequency must be at least higher than 100 Hz. ...
Page 11
... LEDs, (17 350 mA) Finally, an acceptable DCR must be selected regarding losses in the coil and must be lower than 100 mW to limit excessive voltage drop. In addition, as DCR is reduced, NCP5050 overall efficiency will improve. Some recommended inductors include but are not limited to: TDK VLF5012A-2R2M1R5 TDK VLF5014A-2R7M1R5 ...
Page 12
... Finally the NCP5050 is switched off to protect the device if junction temperature exceeds 160°C. When the junction temperature drops below 140°C, normal operation will resume ...
Page 13
... Tape and Reel Packaging Specification Brochure, BRD8011/D. Demo Board Available: • The NCP5050EVB/D evaluation board that configures the device to drive high current through white LED in serial. Application Note Available: • AND8294: Drive Up to 120 LEDs ( Series Configuration) ...
Page 14
... PAD AS WELL AS THE TERMINALS. MILLIMETERS DIM MIN NOM MAX A 0.70 0.75 0.80 A1 0.00 0.03 0.05 A3 0.20 REF b 0.18 0.24 0.30 D 3.00 BSC D2 2.45 2.50 2.55 E 3.00 BSC E2 1.75 1.80 1.85 e 0.50 BSC K 0.19 TYP L 0.35 0.40 0.45 2.6016 1.8508 3.3048 0.5000 PITCH DIMENSIONS: MILLIMETERS ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative NCP5050/D ...