參數(shù)資料
型號： NCP5005
廠商： ON SEMICONDUCTOR
英文描述： Compact Backlight LED Boost Driver(背光LED升壓驅(qū)動器)
中文描述： 緊湊型背光LED升壓驅(qū)動器（背光的LED升壓驅(qū)動器）
文件頁數(shù)： 22/23頁
文件大小： 239K
代理商： NCP5005
NCP5005
http://onsemi.com
22
FIGURES INDEX
Figure 1:
Figure 2:
Figure 3:
Figure 4:
Figure 5:
Figure 6:
Figure 7:
Figure 8:
Figure 9:
Figure 10: Overall Efficiency vs. Power Supply @ I
out
= 4.0 mA, L = 22 H
Figure 11: Overall Efficiency vs. Power Supply @ I
out
= 10 mA, L = 22 H
Figure 12: Overall Efficiency vs. Power Supply @ I
out
= 15 mA, L = 22 H
Figure 13: Overall Efficiency vs. Power Supply @ I
out
= 20 mA, L = 22 H
Figure 14: Overall Efficiency vs. Power Supply @ I
out
= 40 mA, L = 22 H
Figure 15: Feedback Voltage Stability
Figure 16: Feedback Voltage Variation
Figure 17: Standby Current
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Figure 18: Typical Operating Frequency
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Figure 19: Overvoltage Protection
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Figure 20: Typical Power Up Response
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Figure 21: Typical StartUp Inductor Current and Output Voltage
Figure 22: Typical Inductor Current
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Figure 23: Typical Output Voltage Ripple
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Figure 24: Typical Output Peak Voltage
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Figure 25: Efficiency as a Function of V
bat
and Inductor ESR
Figure 26: Noise Returned to the Battery
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Figure 27: Relative EMI Over 100 kHz30 MHz Bandwidth
Figure 28: Basic DC Current Mode Operation with Analog Feedback
Figure 29: Basic DC Current Mode Operation with PWM Control
Figure 30: Operation with Analog PWM, f = 10 kHz, DC = 25%
Figure 31: Typical SemiPulsed Mode of Operation
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Figure 32: Operation @ PWM = 10 kHz, DC = 10%
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Figure 33: Operation @ PWM = 10 kHz, DC = 25%
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Figure 34: Magnified View of Operation @ PWM = 10 kHz, DC = 25%
Figure 35: Output Current as a Function of the Operating Conditions
Figure 36: Examples of Possible LED Arrangements
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Figure 37: NCP5005 Demo Board Schematic Diagram
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Figure 38: NCP5005 Demo Board Top Silkscreen
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Typical Application
Block Diagram
Basic DC/DC Converter Structure
Basic DC/DC Operation
Maximum Output Power as a Function of the Battery Supply Voltage
Typical Inductor Peak Current as a Function of V
bat
Voltage
Maximum Output Current as a Function of V
bat
Output Current Feedback
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Basic Schematic Diagram
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NOTE CAPTIONS INDEX
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
This device series contains ESD protection and exceeds the following tests
The maximum package power dissipation limit must not be exceeded
Latchup current maximum rating:
Moisture Sensivity Level (MSL): 1 per IPC/JEDEC standard: JSTD020A
The overall tolerance depends upon the accuracy of the external resistor
4
4
4
4
5
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100 mA per JEDEC standard: JESD78
ABBREVIATIONS
EN
FB
POR
Enable
Feed Back
Power On Reset: Internal pulse to reset the chip when the power supply is applied
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