tb62730wlg TOSHIBA Semiconductor CORPORATION, tb62730wlg Datasheet - Page 8

• Manufacturer Part Number: tb62730wlg
• Description: Step Up Type Dc-dc Converter For White Led
• Manufacturer: TOSHIBA Semiconductor CORPORATION

TOSHIBA
■ Explanation of operation
【Setting the operating mode】
１．Selecting the four modes shown below with logic input terminals: EN1 and EN2.
・Flash mode
・Torch mode
・Shutdown mode
It can be driven with the constant-current at 800mA (max.).
In case of serial connect 2LEDs, It can be driven with the constant-current at 400mA (max.).
The maximum lightning time is 300ms.
Because it controls the FB+ at 285mV, the equation shown below is obtained.
Pay attentions to the differences of the connected resistors and the power consumption.
The recommended resistor is as follows;
It can light continually by driving at constant-current (350mA in max.).
It sets the current of K1 to K3 based on the resistors: R1, R2, and R3.
The current value of IL is recommended at about 20μA.
Set R2 at 47kΩ
The range of setting resistance is from 33kΩ to 62kΩ.
When R3 is set at 0Ω, the same current is set in the flash mode and the light mode.
It stops the operation.
The operation might be unstable when the condition is in the light load (IF（mA）is 30mA or less). Pay attention in setting
the current.
EN1
H
H
L
L
Iout（mA）＝
・Three or more resistors (1/4 W) in parallel.
Iout（mA）＝285（mV）÷R1（Ω）
0.285V -
EN2
H
H
L
L
0.91V（Vreference）X
R1
R3
R2
Tentative
13-Jun-07 (Rev0.1) TB62730WLG (Page. 8/11)
Shutdown mode
Torch mode
Flash mode
MODE
TB62730WLG