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TB62756FUG Fiches technique(PDF) 4 Page - Marktech Corporate

No de pièce TB62756FUG
Description  Step-up Type DC/DC Converter for White LEDs
Download  14 Pages
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Fabricant  MARKTECH [Marktech Corporate]
Site Internet  http://www.marktechopto.com
Logo MARKTECH - Marktech Corporate

TB62756FUG Fiches technique(HTML) 4 Page - Marktech Corporate

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TB62756FUG
2005-11-8
4
PWM
VIN
4.7-10µH
1µF
2.2µF
16Ω
@20mA
500Ω
Vz=24V
CTL
AMP.
Error
AMP.
SW
NC
GND
SHDN
VIN
1
3
4
2
6
5
Monostable
multivibrator
for
reference
Monostable
multivibrator
for
off time control
Circuit
on/off
FB
Application Circuit Example
Protection at the time of LED opening
The zener diode in the application circuit example is necessary for the provision of over-voltage protection for
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.
The zener diode should satisfy the following conditions:
i)
Less than maximum output voltage of 24V
ii)
Greater than the total series LED VF
iii) Less than the maximum output capacitance C2.
Moreover, by connecting a protection circuit such as R_ZD in the figure below, it is possible to control the output
current when the LED becomes open, and to use a zener diode of lower tolerance.
An example of IZD control by R_ZD connection. (RSENS
= 16 Ω)
R_DZ (
Ω)
IZD (mA)
500
0.6 (Typ.)
100
2.8 (Typ.)
In order to avoid adverse effects on driver characteristics,
Toshiba recommends a resistance of 500 ohms or less.
Protection circuit application
SW
GND FB
S-Di
IZD
1
µF
C2
R_ZD
RSENS
IF


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