TB62736FUG Toshiba, TB62736FUG Datasheet - Page 5

• Manufacturer Part Number: TB62736FUG
• Manufacturer: Toshiba

Specifications of TB62736FUG

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

Output-side Capacitor Setting
It is recommended that the value of C
External Inductor Size Setting
Control of I
Current control using SHDN pin
The IF current set by the RSENS pin resistance can be varied in the range of 25 to 100%.
Linearity error at VA conversion is ±10%.
Dimming using PWM signal input
A dimming function can also by applied using a PWM signal.
[Notes]
<<Output current is calculated using the following equation>>
For each number of LEDs, the selected inductance should be greater than the value indicated in the table below.
The resistance RSENS is connected between the FB pin and the GND pin.
The average current is controlled by the RSENS value, and calculated using the following equation:
Margin of error is ±5%.
▪When using a PWM signal, the minimum pulse width of the PWM should be greater than 33μs.
▪Duty ratio of PWM function should be set at 10% to 90%.
▪The recommended PWM frequency should be 100 Hz to 10 kHz.
Number of LEDs
I
SHDN Voltage
F
Valuable Rate
2
3
4
5
6
F
Inductance (Unit: μH)
VSHDN=0 V to 0.5 V VSHDN=1 V to 2.5 V
I
100
F
IF(mA) =
80
60
40
20
(mA) = [ 325 mV / RSENS(Ω) ]
0
1.0
4.7
6.8
10
0
2
be equal to, or greater than 1.0 (μF).
SHDN input - output rate/output current
1.3
325[mV] × ON Duty [%]
I
F
1.6
= 20 mA
VIN=3.0V
VSHDN(V)
Note
RSENS [Ω]
25 - 100
5
1.9
2.2
IF rate
IF
VSHDN>2.5 V
2.5
100
25
20
15
10
5
0
TB62736FUG
UNIT : %
2010-06-24
Note