tb62730wlg TOSHIBA Semiconductor CORPORATION, tb62730wlg Datasheet - Page 9

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

TOSHIBA
【Setting the external inductor】
【Soft start function】
【OVP function】
【TSD function】
Operating frequency : 2MHz
The circuit operation has the
constant of the inductor.
switching from the shutdown mode (EN1＝"L") to the flash or write mode(EN1＝"H").
In applying the recommended application constant number, the rising time in the flash mode is about 300
μs.
design for the mass production.
OVP voltage： Detecting the over-load at 10V(MIN.).
When the loaded voltage of OVP rises because of the LED opening or something other,
this function shutdowns the IC.
The operation recovers just after the voltage of OVP falls to 10V（MIN.) or less.
The rush current might generate in input current when the connecting chattering exists in recovering from
the OVP operation to the normal operation.
The rush current depends on the usage conditions (the number of the LED lights, LED set current, and
input voltage) and the chattering interval. So, evaluate the IC enough to design for the mass production.
※Example of rush current by chattering in LED reconnecting.
circuit drives.
Soft start function is built in to prevent the exceeding rush current and the decreasing of power voltage in
The rising time depends on the LED set current and the power voltage. So, evaluate the IC enough to
Internal shutdown circuit operates to turn off the output when IC temperature reaches the rating and TSD
Setting TSD operating temperature: 120℃ to180℃.
Conditions）Power voltage: 3.6V, 1LED
RSENS＝0.375Ω(IF=800mA), flash lamp mode
K terminal voltage （5V/DIV)
Input current（100mA/DIV)
RSENS voltage（1V/DIV)
VOUT（5V/DIV)
※ Output current=
consecutive
mode method. The ability of the output current is changed by the
RSENS terminal voltage
RSENS resistance
Tentative
13-Jun-07 (Rev0.1) TB62730WLG (Page. 9/11)
TB62730WLG