TK11880FTL-G Datasheet, PDF (1/2 Pages) TOKO, Inc – Step-Up DC-DC Converter

Step-up DC-DC converter
昇圧型DC-DCコンバータIC
POWER&RF
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.
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をドライブ出来ます。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。
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
„ 動作電圧範囲 2.65 to 10V
„ 動作周波数 1MHz
„ スイッチングトランジスタ内蔵
„ 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 記号Rating
定格
動作電圧範囲
V_OP
動作温度範囲
T_OP
許容消費電力
P_D
動作周波数範囲
f_OP
2.65 to 10.0
-30 to +85
600
1.0
Unit 単位 Remarks
備考
V
°C
mW *Board mounted 基板実装時
MHz
ELECTRICAL CHARCTERISTICS
Parameter
V_IN=3V, T_A=25°C
項目Symbol 記号 _MIN.
Value
TYP.
MAX. ^Unit
単位 Conditions
条件
Oscillator section 発振器部
Operating frequency
動作周波数
f
0.7 1.0 1.3
MHz
Error amplifier section (V_fb pin, Ea_out pin) エラーアンプ部 (V_FB 端子, EA_OUT 端子)
2005 FALL