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參數(shù)資料
| 型號： | FAN5333B |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Efficiency, High Current Serial LED Driver with 30V Integrated Switch |
| 中文描述： | 高效率，高電流和30V的串行LED驅(qū)動器集成開關(guān) |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 538K |
| 代理商： | FAN5333B |
8
www.fairchildsemi.com
FAN5333A/FAN5333B Rev. 1.0.1
F
Inductor Selection
The inductor parameters directly related to device performances
are saturation current and dc resistance. The FAN5333A/
FAN5333B operates 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 1A, in
an application having the LED current near the maximum cur-
rent as indicated in “Typical Performance Characteristics”. The
peak inductor current is limited to 1.5A by the current sense
loop. 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 auto-
matic turn-off of the switching transistor, resulting in higher rip-
ple 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 as close to the IC pins, are required for the maximum
load(65mA). For the lighter load (
be reduced to C
IN
= 4.7μF and C
if higher ripple is acceptable. The output capacitor voltage rating
should be according to the V
OUT
suggested in the table below.
IN
= 10μF and C
OUT
= 1μF
≤
20mA
= 0.47μF or even to 0.1μF,
)
the capacitances may
OUT
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 8 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 8. 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 8 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
1μF
Murata
GRM21BR61E105K
10μF
Murata
GRM21BR61A106K
I
MIN
V
MIN
R
=
and I
MAX
V
MIN
R
SET
R
=
SHDN
FAN5333
FB
FAN5333
R
MIN
R
SET
FB
V
DC
90K
5
1.6K
FAN5333A
FB
V
DC
90K
15
4.7K
FAN5333B
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| FAN5333BSX | 功能描述:LED照明驅(qū)動器 SYSTEM_POWER RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SO-16N |
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