tb62736fugel Marktech Optoelectronics, tb62736fugel Datasheet - Page 4
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tb62736fugel
Manufacturer Part Number
tb62736fugel
Description
Step-up Type Dc-dc Converter For White Leds
Manufacturer
Marktech Optoelectronics
Datasheet
1.TB62736FUGEL.pdf
(13 pages)
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