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參數(shù)資料
| 型號(hào)： | TB62732FUG |
| 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： | 升壓直流/直流轉(zhuǎn)換器白光LED驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 7/18頁(yè) |
| 文件大?。?/td> | 294K |
| 代理商： | TB62732FUG |
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TB62732FUG
2006-06-14
7
Output-side capacitor setting
To reduce the effect of ripple current, we recommend C
2
=
0.47 (
μ
F) or above.
Capacitor C2 (
μ
F)
Ripple Current (mA)
Note
0.01
15 to 25
0.1
5 to 8
0.47
2 to 4
1
1 to 3
Recommend
External inductance setting
The minimum external inductance is calculated as follows:
L (
μ
H)
=
((K
×
P
o
)
V
IN
min
×
I
O
)
×
(1/f
OSC
min)
×
2
×
(1/Ip min
×
Ip min) . . . formula 2
The above parameters are described below:
P
o
: output power (power required by LED load)
P
o
(W)
=
V
F
LED
×
I
F
LED
+
Vf schottky
×
I
F
LED
+
R_sens
×
I
F
LED
×
I
F
LED
LED forward current: I
F
LED (mA)
=
Set current: I
O
(mA), LED forward voltage: V
F
LED (V),
Schottky diode forward voltage: Vf schottky (V),
Setting resistance: R_sens (
)
V
IN
min (V): Minimum input voltage (battery voltage)
I
O
(A): The average current value established with R_sens.
f
OSC
(Hz): The switching frequency of the internal MOS transistor
Min
Typ.
Max
Unit
f
OSC
0.77
1.1
1.43
MHz
Ip (A): Peak current value for supply to the inductance
Min
Typ.
Max
Unit
Ip
320
350
380
MHz
For example, the following condition is substituted for the formula:
Input voltage V
IN
: V
IN
=
3 to 4.3 V,
V
F
LED
=
16 V, Schottky diode Vf: Schottky
=
0.3 (V),
Setup resistance R_sens: R_sens = 2.7 (
),
Setup current I
O
: I
O
=
18.5 mA,
L (
μ
H)
=
5.6 (
μ
H, V
IN
=
3.0 V) and 6.3 (
μ
H, V
IN
=
4.3 V).
In this case, Toshiba recommend selection of L = 5.6 (
μ
H) when V
CC
=
3 V. .
This value does not allow for inductor variation and temperature characteristics; therefore we strongly
recommend that these factors be taken into account when selecting products.
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