tb62736fugel Marktech Optoelectronics, tb62736fugel Datasheet - Page 4

• Manufacturer Part Number: tb62736fugel
• Description: Step-up Type Dc-dc Converter For White Leds
• Manufacturer: Marktech Optoelectronics

Application Circuit Example
Protection at the time of LED opening
when the LED becomes open. As the IC does not incorporate a voltage protection circuit, it is strongly advised that
a zener diode be connected.
current when the LED becomes open, and to use a zener diode of lower tolerance.
The zener diode in the application circuit example is necessary for the provision of over-voltage protection for
The zener diode should satisfy the following conditions:
Moreover, by connecting a protection circuit such as R_ZD in the figure below, it is possible to control the output
An example of IZD control by R_ZD connection. (RSENS = 16 Ω)
In order to avoid adverse effects on driver characteristics,
Toshiba recommends a resistance of 500 ohms or less.
i)
ii)
iii)
VIN
R_DZ (Ω)
Less than maximum output voltage of 24V
Greater than the total series LED V
Less than the maximum output capacitance C
2.2µF
500
100
1.0-2.5V
Analog
PWM
SHDN
VIN
3
1
IZD (mA)
Reference
Mono Multi
0.6
1.0
Level
Detect
4.7-10µH
CTL
AMP.
F
Off Time
Control
Mono Multi
4
SW
2
.
4
Error
AMP.
CTL
AMP.
GND
2
5
NC
Protection circuit application
6
GND FB
SW
FB
S-Di
Vz=24V
500Ω
IZD
TB62736FUG
RSENS
R_ZD
1 µF
C2
2004-10-29
16Ω
@20mA
1µF
IF