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ADM8845 датащи(PDF) 17 Page - Analog Devices

номер детали ADM8845
подробное описание детали  Charge Pump Driver for LCD White LED Backlights
PDF  20 Pages
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производитель  AD [Analog Devices]
домашняя страница  http://www.analog.com
Logo AD - Analog Devices

ADM8845 датащи(HTML) 17 Page - Analog Devices

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ADM8845
Rev. 0 | Page 17 of 20
POWER EFFICIENCY
The ADM8845 power efficiency (η) equations are
η
= POUT/PIN
PIN = ((VCC × ILOAD × Gain) + (IQ × VCC))
POUT = 6×(VF × ILED)
where:
IQ is the quiescent current of the ADM8845, 2.6 mA.
VF is the LED forward voltage.
Gain is equal to charge pump mode (1×, 1.5×, 2×).
FB1
FB2
FB3
FB4
FB5
FB6
VOUT
CTRL1
CTRL2
RSET
ISET
ADM8845
VCC
3.4V
VCC
GND
ILOAD
IIN
Figure 34. Charge Pump Power Efficiency Diagram
Examples 1 and 2 show calculations of the ADM8845 power
efficiency; also see Figure 34.
Example 1
The ADM8845 driving six white LED with 20 mA/LED at
VCC = 3.4 V (1.5× mode), LED VF = 4.5 V.
PIN = ((VCC × ILOAD × Gain) + (VCC × IQ))
PIN = ((3.4 × 120 mA × 1.5) + (3.4 × 2.6 mA))
PIN = ((0.612) + (0.00884))
PIN = 0.62084
POUT = 6(VF × ILED)
POUT = 6(4.5V × 20 mA)
POUT = 0.54
η = POUT/PIN
η = 0.54/0.62084
η = 87 %
Example 2
The ADM8845 driving six white LED with 20 mA/LED at
VCC = 3.4 (1.5× mode), LED VF = 3.6 V.
PIN = ((VCC × ILOAD × Gain) + (VCC × IQ))
PIN = ((3.4 × 120 mA × 1.5) + (3.4 × 2.6 mA))
PIN = ((0.612) + (0.00884))
PIN = 0.62084
POUT = 6(VF × ILED)
POUT = 6(3.6 V × 20 mA)
POUT = 0.432
η = POUT/PIN
η = 0.432/0.62084
η = 70 %



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