TB62752AFUG Toshiba, TB62752AFUG Datasheet - Page 4

• Manufacturer Part Number: TB62752AFUG
• Manufacturer: Toshiba

Specifications of TB62752AFUG

• Package: SOT23-6
• Supply Voltage: 2.8V to 5.5V
• # Leds Supported: 2 to 6 LEDs in series
• Sw Frequency: 1.1MHz
• Led Current Accuracy: ±5.23% (max)
• Protection Feature: Output overvoltage protection
• Other Features & Functions: -
• Rohs Compatible Product(s) (#): Available

Usage Precautions
Protection in LED Opened Condition
IC. When the voltage of OVD terminal drops below 34.5 V (MIN), Nch MOSFET switching operation becomes
available again.
and the IC is protected from unexpected over voltage.
Setting of Capacitor
Setting of I
Setting of External Inductor Size
The operation with OVD terminal is available for the protection in case LED circuit opened.
When the voltage of OVD terminal is over 34.5 V (MIN), Nch MOSFET switching operation is disabled in the
If load of LED is detached, Nch MOSFET switching operation is disabled with detection of boost circuit voltage
The recommended values are
The capacitor of ceramic condenser tends to decrease when voltage is applied.
So, please select the appropriate capacitor in consideration of IC characteristics of withstand voltage and size.
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.
Current value error is within ±5%.
Please select the inductor size with referring this table corresponding to each number of LEDs.
[Recommended inductor values]
C
I
F
1
= 2.2 (μF) or more,
(mA)
Over 6
F
LEDs
2 to 5
=
RSENS
300
[mV]
[
Ω
]
Indictor Size
C
2
10 μ H
22 μ H
= 1.0 (μF) or more
LED current I
4
F
= 20 mA
Note
TB62752AFUG
2011-06-08