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參數資料
| 型號： | TK11880F |
| 廠商： | TOKO INC |
| 元件分類： | 顯示驅動器 |
| 英文描述： | Step-Up DC-DC Converter |
| 中文描述： | LED DISPLAY DRIVER, DSO8 |
| 封裝： | 3 X 2.40 MM, 0.75 MM HEIGHT, LEAD FREE, SON-8 |
| 文件頁數： | 1/2頁 |
| 文件大小： | 176K |
| 代理商： | TK11880F |
POWER&RF
2005 FALL
Step-up DC-DC converter
昇圧型
DC-DC
コンバータ
IC
TK11880FTL-G
(SON3024-8)
DESCRIPTION
The TK11880FTL-G is a step-up DC-DC converter designed
for White LED driver applications, using constant frequency
PWM architecture, with the following built in: a very high
current switching transistor 0.6A peak), a high speed
oscillator (1.0MHz), a switch over current detector, a low
voltage reference (VRef=0.495V), an error amplifier, a PWM
comparator, a zener diode for open-circuit protection and
ON/OFF control.
TK11880FTL-G can drive up to six White LEDs in series.
This IC works with a very wide operation supply range
(2.65V~10V) and the adjustable output voltage can be set as
high as 24.5V. The white LEDs are connected in series and
driven at a constant current, resulting in uniform brightness
and high efficiency. The reference voltage is a very low
0.495V, achieving high efficiency operation with the constant
current output. The ON/OFF control is built-in and the circuit
current can be decreased when the EN pin is low (shutdown
mode). The built-in zener diode can be used for open-circuit
protection in case the output load is disconnected, such as
the string of LEDs opened. The internal zener diode reduces
the external component count.
The TK11880FTL-G can also be used in other applications
as a step-up DC-DC converter.
The TK11880FTL-G is available in the SON3024-8 surface
mount package.
FEATURES
Very wide operating voltage range (2.65 to 10V)
1.0MHz operation
Internal switching transistor
Maximum duty cycle 93%
24.5v
MAX
output
Very small inductor available
Very small package SON3024-8
TK11880FTL-G
は白色
LED
をドライブするために開発した、
PWM
方式昇圧型
DC-DC
コンバータ
IC
です。直列に接続され
た最大
6
個の白色
LED
をドライブ出來ます。白色
LED
直列接
続、定電流駆動構成で、輝度ムラが少なく、高効率で動作し
ます。基準電圧は
0.5V
と低く、定電流出力で高効率です。そ
の他、一般的な昇圧型
DC-DC
コンバータとしても使用可能
です。
動作電圧範囲
2.65 to 10V
動作周波數
1MHz
スイッチングトランジスタ內蔵
最大デューティーサイクル
93
％
最大出力電圧
24.5V
小型コイル使用可能
0.75mm
薄型パッケージ
SON3024-8
ABSOLUTE MAXIMUM RATINGS
Parameter
Operating voltage range
Operating temperature range
Power dissipation
Operating frequency range
項目
Symbol
動作電圧範囲
動作溫度範囲
許容消費電力
動作周波數範囲
記號
Rating
2.65 to 10.0
-30 to +85
定格
Unit
V
°
C
mW
MHz
単位
Remarks
備考
V
OP
T
OP
P
D
f
OP
600
1.0
*Board mounted
基板実裝時
ELECTRICAL CHARCTERISTICS
V
IN
=3V, T
A
=25
°
C
Value
TYP.
Parameter
項目
Symbol
記號
MIN.
MAX.Unit
単位
Conditions
條件
Oscillator section
発振器部
Operating frequency
Error amplifier section (V
fb
pin, Ea
out
pin)
エラーアンプ部
(V
FB
端子
, EA
OUT
端子
)
動作周波數
f
0.7
1.0
1.3
MHz
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