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AL9910/ AL9910A/ AL9910-5
Applications Information (cont.)
Design Example
For an AC line voltage of 120V the nominal rectified input voltage V IN = 120V*1.41 = 169V. From this and the LED chain voltage the duty cycle
can be determined:
D = V LEDs /V IN = 30/169 = 0.177
From the switching frequency, for example f OSC = 50kHz, the required on-time of the external MOSFET can be calculated:
t ON = D/f OSC = 3.5 μs
The value of the inductor for an LED current of 350mA is determined as follows:
L = (V IN - V LEDs ) * t ON /(0.3 * I LED ) = 4.6mH
Input Bulk Capacitor
For Offline lamps an input bulk capacitor is required to ensure that the rectified AC voltage is held above twice the LED string voltage throughout
the AC line cycle. The value can be calculated from:
C IN ≥
P IN × ( 1 ? D CH )
2 × V LINE _ MIN × 2 f L × Δ V DC _ MAX
Where
D ch : Capacity charge work period, generally about 0.2 to 0.25
f L : Input frequency for full range (85 to 265V RMS )
Δ V DC _ MAX Should be set 10 to15% of
2 V LINE _ MIN
If the capacitor has a 15% voltage ripple then a simplified formula for the minimum value of the bulk input capacitor approximates to:
C MIN = LED
I
× V LEDs × 0.06
V IN 2
Power Factor Correction
If power factor improvement is required then for the input power less than 25W, a simple passive power factor correction circuit can be added to
the AL9910 typical application circuit. Figure 4 shows that passive PFC circuitry (3 current steering diodes and 2 identical capacitors) does not
significantly affect the rest of the circuit. Simple passive PFC improves the line current harmonic distortion and achieves a power factor greater
than 0.85.
Passive PFC
LED +
C1
D1
C4
V AC IN
BR1
V DD
LD
V IN
AL9910/A
GATE
Q1
L1
LED -
PWM_D
CS
C2
C3
R OSC
GND
R SENSE
R OSC
Figure 4. Typical Application Circuit with Passive PFC
Each of these identical capacitors should be rated for half of the input voltage and have twice as much capacitance as the calculated C MIN of the
buck converter circuit without passive PFC (see above section on bulk capacitor calculation).
For further design information please see AN75 from the Diodes website.
AL9910/ AL9910A/ AL9910-5
Document number: DS35103 Rev. 8 - 2
10 of 15
www.diodes.com
December 2012
? Diodes Incorporated
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RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
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AL9910EV5
功能描述:AL9910A 1, Non-Isolated Output LED Driver Evaluation Board 制造商:diodes incorporated 系列:- 零件状态:有效 电流 - 输出/通道:240mA 输出和类型:1，非隔离 电压 - 输出:- 特性:- 电压 - 输入:85 ~ 277 VAC 所含物品:板 使用的 IC/零件:AL9910A 标准包装:1
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RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N
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