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參數(shù)資料
| 型號(hào)： | TB62731FUG |
| 廠商： | Toshiba Corporation |
| 元件分類： | LED驅(qū)動(dòng)器 |
| 英文描述： | Step-up DC-DC Converter for White LED Driver |
| 中文描述： | 升壓型DC - DC轉(zhuǎn)換器，用于白光LED驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大小： | 250K |
| 代理商： | TB62731FUG |
TB62731FUG
2006-06-14
9
Selection of R_sens
Resistance between pin K and GND R_sens (
) is used for setting output current I
o
. The mean output current I
o
can be set according to the resistance.
The mean current I
o
(mA) to be set is roughly calculated as follows:
I
o
(mA)
=
36 (mV)
÷
R_sens (
)
For example, when R_sens
=
1.8 (
), I
o
=
20 (mA).
Take a current error of
±
10% (not including R_sens error) into consideration.
The IC has a minimum output P
o
=
320 (mA, choke coil
=
47
μ
H).
At that time, if the product of mean current I
o
and output voltage V
o
exceeds P
o
=
320 (mW), mean current I
o
may become less than the desired value.
If the IC is not connected to the output-side capacitor (for smoothing), the set current I
o
can be obtained.
At that time, because the current flowing to the LED is a pulse current with a maximum peak value of 270 mA,
make sure that surge current IFP (mA) does not flow to the LED.
Toshiba recommend use of components with low reactance (parasitic inductance) and minimized PCB wiring.
Toshiba also recommend allocating components in the application circuit diagram as near each other as possible.
Relation between set current IO and setting resistance R_sens
(typical value: V
CC
=
3.6 V, Ta
=
25
°
C)
40
: Io (mA)
Figure 4
Resistance for setting current R_sens (
)
S
O
0
3.3 2.7 2.2 2 1.8 1.5
1.2 1
10
20
30
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