TB62752BFUG Toshiba, TB62752BFUG Datasheet - Page 5

• Manufacturer Part Number: TB62752BFUG
• Manufacturer: Toshiba

Specifications of TB62752BFUG

• Package: SOT23-6
• Supply Voltage: 2.8V to 5.5V
• # Leds Supported: 2 to 7 LEDs in series
• Sw Frequency: 1.0MHz
• Led Current Accuracy: ±5.0% (max)
• Protection Feature: Output overvoltage protection
• Other Features & Functions: -
• Rohs Compatible Product(s) (#): Available

Current Dimming Control
Recommended brightness control circuits are 4 types.
(1)
Input PWM signal to SHDN terminal
I
<<PWM signal frequency>>
<<Constant number of external condenser>>
<<PWM input signal>>
<<Rush current in inputting>>
<<Current value in control with PWM: Ideal equation>>
<<Recommended application>>
F
•
•
•
•
can be adjusted with PWM signal by inputting it to SHDN terminal.
The recommended PWM signal frequency is from 100 Hz to 10 kHz. There is a possibility to arise the
audible frequency in mounting to the board because it is within the auditory area. The greater the
oscillation frequency is, the greater the error between the actual value and the theoretical value
becomes.
When the PWM signal is off, the time to drain C
the actual value is little different from the theoretical value.
Set the amplitude of PWM signal within the range of SHDN terminal specification.
In case dimming by inputting the PWM signal to the SHDN terminal, this IC turns on and off
repeatedly.
And the rush current, which provides the charge to C
condenser.
I
F
[mA]
=
300
PWM signal
[mV]
2.8 to 5.5 V
RSENS
VIN =
×
ON
[
Duty
Ω
]
[%]
SHDN
VIN
5
22 μ H
GND
2
OVD
SW
of charge depends on the constant number. And so,
FB
S-Di
2
, arises in turning on. Take care in selecting the
TB62752BFUG
2011-06-08