TB62756FUG Toshiba, TB62756FUG Datasheet - Page 4

• Manufacturer Part Number: TB62756FUG
• Manufacturer: Toshiba

Specifications of TB62756FUG

• 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: -
• Other Features & Functions: -
• Rohs Compatible Product(s) (#): -

Application Circuit Example
Protection at the Time of LED Opening
event 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 I
Toshiba recommends a resistance of 500 Ω or less.
The zener diode in the application circuit example is necessary for the provision of over-voltage protection in the
The zener diode should satisfy the following conditions:
Moreover, by connecting a protection circuit such as R
An example of I
In order to avoid adverse effects on driver characteristics,
i)
ii)
iii) Less than the maximum output capacitance C
ZD
V
Less than maximum output voltage of 24 V
Greater than the total series LED V
R
IN
ZD
500
100
when the LED becomes open, and to use a zener diode of lower tolerance.
( Ω )
SHDN
PWM
ZD
V
IN
control by R
3
1
0.6 (typ.)
2.8 (typ.)
I
4.7 to 10 μ H
ZD
multivibrator
Monostable
reference
(mA)
ZD
Circuit
on/off
for
connection. (R
f
off time control
multivibrator
Monostable
SENS
for
4
2
ZD
SW
.
= 16 Ω)
4
in the figure below, it is possible to control the output
AMP.
AMP.
Error
CTL
Protection Circuit Application
NC
GND FB
2
SW
GND
5
S-Di
6
FB
I
ZD
500 Ω
R
TB62756FUG
R
SENS
ZD
2010-06-27
I
F
1 μ F
C
2