tb62752afugel Marktech Optoelectronics, tb62752afugel Datasheet - Page 4

• Manufacturer Part Number: tb62752afugel
• Description: Step Up Type Dc/dc Converter For White Led
• Manufacturer: Marktech Optoelectronics

Protection in LED opened condition
Setting of external Capacitor
Setting of I
The operation with OVD terminal is available for the protection in case LED Circuit opened.
Please see the example of application circuit.
If load of LED is detached, Nch MOS switching operation is disabled with detection of boost circuit voltage.
Current Value error is within ±5%.
In case not using PWM signal to SHDN terminal for brightness control, recommended values are
In case with PWM signal to SHDN terminal for brightness control, recommended values are
The recommended capacitor values depend on the Brightness Control Method.
<Please see after page-8>
The capacitor value must be considered for gain enough accuracy of brightness with reduction of noise from
Input current changing.
Resistance connects between RSENS pin and GND.
The average current is set by this RSENS value and average current are obtained by the following equation.
O
I
F
[mA] =
C
C
and up accuracy of brightness.
1
1
= Over 2.2 (µF), C
= Over 4.7 (µF), C
RSENS [Ω]
300[mV]
2
2
=Under 0.1 (µF) to reduce fluctuation of input current
= Over 1.0 (µF)
4
TENTATIVE
TB62752AFUG
2005-08-5