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參數(shù)資料
| 型號： | TB62732FUG |
| 廠商： | Toshiba Corporation |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | Step-up DC/DC Converter for White LED Driver |
| 中文描述： | 升壓直流/直流轉(zhuǎn)換器白光LED驅(qū)動器 |
| 文件頁數(shù)： | 8/18頁 |
| 文件大?。?/td> | 294K |
| 代理商： | TB62732FUG |
TB62732FUG
2006-06-14
8
Selection of R_sens
The resistance R_sens (
) between pin K and GND is used for setting the output current I
O
. The mean output
current I
O
can be set using this resistance.
The mean current I
O
(mA) to be set is roughly calculated as follows:
I
o
(mA)
=
V (K): pin K feedback voltage (mV)
÷
R_sens
)
Pin K voltage
V (K)
Number of LEDs
Note
2
48
3
50
4
52
For example, if R_sens
=
2.7 (
), then I
O
=
18.5 (mA) with a current error of
±
12%.
The IC has a minimum output P
o
=
320 (mW).
In this case, if the product Po
of the set current I
F
LED and the output voltage V
F
LED exceeds P
o
= 320 (mW), it
is possible that the current IF LED will not exceed a given value.
If the IC is not connected to the smoothing capacitor, then I
F
LED is obtained as the mean current.
In this instance, because the current which flows to the LED is a triangular waveform current with a maximum
peak value of 380 mA, make sure that the inrush current I
FP
(mA) does not flow to the LED.
Toshiba recommend use of components with low reactance (parasitic inductance) and minimized PCB wiring.
Protection for when the LED is open
The zener diode in the example application circuit in Figure 1 is necessary for over-voltage protection when the
LED is open.
It is strongly recommended that a zener diode be connected since this driver lacks a voltage protection circuit.
The zener voltage should satisfy the following conditions:
i)
≤
maximum output voltage of the TB62732FUG
ii)
≥
LED aggregate V
f
iii)
≤
maximum output capacitance C
2
.
Moreover, it is possible to control the output current IZD for when the LED is open by connecting the R_ZD as in
Figure 4, and to use a zener diode with lower power dissipation.
Standard for Control of Output Current IZD through R_ZD Connection
(R_sens
=
2.7
)
R_DZ (
)
IZD (mA)
18
3
100
0.1
Since driver characteristics may be adversely affected,
Toshiba recommend 100
or less.
A
GND
K
S-Di
IZD
0.47
μ
F
C2
R_ZD
R_sens
2.7
IF
Figure 4 Application Circuit
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TB62733FTG | 制造商:TOSHIBA 制造商全稱:Toshiba Semiconductor 功能描述:Charge Pump type DC/DC Converter for White LED Driver |
| TB62734FMG | 制造商:MARKTECH 制造商全稱:Marktech Corporate 功能描述:Step Up Type DC-DC Converter for White LED |
| TB62736FUG | 制造商:MARKTECH 制造商全稱:Marktech Corporate 功能描述:Step-up Type DC-DC Converter for White LEDs |
| TB62736FUG(O,EL) | 功能描述:LED照明驅(qū)動器 White LED Driver 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TB62737FPG(O,EL) | 功能描述:LED照明驅(qū)動器 White LED Driver 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: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
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