Page 126 2010 AUTUMN
TK11851
DCDC Converter, 1ch, Step-up, Inductive
DCDCコンバータ、1ch、昇圧、インダクティブ
Feature
Very high speed adjustable OSC 最大発振周波数
- 800kHz max - 800kHz max
Low loss detector 検出損失が小さい
- low reference voltage: Vref=0.515V - 低基準電圧Vref=0.515V
Operates with TOKO d31fu, D31FB miniature coil
小型コイル使用可能
(current limited by inductor current sensor)
Internal switching transistor 耐圧20Vスイッチングトランジスタ内蔵
- 400mApeakMAX - 400mApeakMAX
Open-circuit protection (OVP) 出力オープン保護機能(OVP)
Active high on / off control
En
機能
(ON/OFF,
シャットダウン電流
1
μ
A
以下
)
Available intensity control PWM信号入力(En端子)による調光可能
using En pin with PWM signal
Low component count 低電源電流
Operating Voltage Range VOP=2.3 to 10V 動作電圧範囲VOP=2.3~10V
Operating Temp. Range TOP=-30 to +85°C 動作温度範囲TOP=-30~+85°C
Power Dissipation PD=400mW 許容消費電力PD=400mW
Characteristics
Part Name Number of
Current Stabilizer
fOSC Number of LED in
serial connection
ILED Max
TK11851 - 800kHz 2 to 4 LED 15mA
Ordering Guide, Marking
Part Name Ordering Name Marking Description Order
Size
TK11851 TK11851LTL-GH 1851
TK11851: Part Name
L: SOT23L-8 Package
TL: Tape&Reel, Left
-GH:
PB-Free&Halogen Fre
e
1,300
pcs.
/Reel
Block Diagram, Standard Application
Is
Ext
Vfb
Gnd
Cx
Vin
2
36
En
Vovp
Error
Comp
Vref
Is Comp
0.515V
VIs
Band Gap Reference
CLK
Q
S
R
7
8
1
Rsc
TK11851
5
4
OSC
CLK
Cx
0.86V
0.3V
0.1V
0.3
Ω
C
X
R
LED
68pF
33
Ω
L
22
μ
H
2.2
μ
FC
OUT
1
μ
F
C
IN
D
I
LED
V
LED
on/offEn
4
81
2
3
TK11851L
5
6
7
V
IN
I
S
E
XT
V
OVP
V
FB
C
X
GND
