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參數(shù)資料
| 型號： | LQH66SN100M01C |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | High Efficiency Serial LED Driver with 30V Integrated Switch |
| 中文描述： | 高效率串行LED驅(qū)動器30V的集成開關(guān) |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 520K |
| 代理商： | LQH66SN100M01C |
7
www.fairchildsemi.com
FAN5330 Rev. 1.0.1
F
Inductor Selection
The inductor parameters directly related to device performances
are saturation current and dc resistance. The FAN5330 oper-
ates with a typical inductor value of 10μH. The lower the dc
resistance, the higher the efficiency. Usually a trade-off between
inductor size, cost and overall efficiency is needed to make the
optimum choice.
The inductor saturation current should be rated around 1.5A,
which is the threshold of the internal current limit circuit. This
limit is reached only during the start-up and with heavy load
condition; when this event occurs the converter can shift over in
discontinuous conduction mode due to the automatic turn-off of
the switching transistor, resulting in higher ripple and reduced
efficiency.
Some recommended inductors are suggested in the table
below:
Table 1: Recommended Inductors
Capacitors Selection
For best performance, low ESR input and output capacitors are
required. Ceramic capacitors of C
placed close to the IC pins, are required for optimum perfor-
mance. The capacitances (C
OUT
higher ripple is acceptable. The output capacitor voltage rating
should be according to the V
OUT
suggested in the table below
IN
= 4.7μF and C
OUT
= 0.47μF
) may be reduced to 0.1μF, if
setting.
Some capacitors are
Table 2: Recommended Capacitors
Diode Selection
The external diode used for rectification is usually a Schottky
diode. Its average forward current and reverse voltage maxi-
mum ratings should exceed the load current and the voltage at
the output of the converter respectively. A barrier Schottky diode
such as BAT54 is preferred, due to its lower reverse current over
the temperature range.
Care should be taken to avoid any short circuit of V
even with the IC disabled, since the diode can be instantly dam-
aged by the excessive current.
OUT
to GND,
Brightness Control
1. Dimming Using PWM Logic Signal
A PWM signal applied to SHDN Table 5 on page 7 can control
the LED’s brightness in direct dependence with the duty cycle.
The maximum frequency should not exceed 1kHz to ensure a
linear dependence of the LED’s average current. The amplitude
of the PWM signal should be suitable to turn the FAN5333 ON
and OFF.
Alternatively, a PWM logic signal can be used to switch a FET
ON/OFF to change the resistance that sets the LED’s current
Table 6 on page 7. Adjusting the duty cycle from 0% to 100%
results in varying the LED’s current between I
MIN
and I
MAX
.
Where
Figure 5. Dimming Using a PWM Signal
Figure 6. Dimming Using a PWM Logic Signal
2. Dimming Using DC Voltage
An external adjustable DC voltage Table 7 on page 7 between
0V to 2V can control the LED’s current from 15mA to 0mA,
respectively.
Figure 7. Dimming Using DC Voltage
Inductor
Value
Vendor
Part Number
Com-
ment
10μH
TDK
SLF6025&-100M1R0
10μH
MURATA
LQH66SN100M01C
Highest
Efficiency
10μH
COOPER
SD414-100
Small Size
Capacitor
Value
Vendor
Part Number
0.47μF
Panasonic
ECJ-3YB1E474K
4.7μF
Murata
GRM21BR61A475K
I
MIN
V
MIN
R
=
and I
MAX
V
MIN
R
SET
R
=
SHDN
FAN5330
FB
FAN5330
R
MIN
R
SET
FB
V
DC
90K
5
1.6K
FAN5330
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| LQH66SN100M01L | 功能描述:固定電感器 2525 10uH +/-20% RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
| LQH66SN100M03L | 功能描述:固定電感器 10uH 20% RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
| LQH66SN101M01L | 功能描述:固定電感器 2525 100uH +/-20% RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
| LQH66SN101M03L | 功能描述:固定電感器 100uH 20% RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
| LQH66SN102M01L | 功能描述:固定電感器 2525 1000uH +/-20% RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm |
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