TB62725 データシートの表示（PDF） - Marktech Optoelectronics

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TB62725

8BIT CONSTANT CURRENT LED DRIVER WITH OPERATING VOLTAGE OF 3.3V

Marktech Optoelectronics 

TOSHIBA

APPLICATION NOTES(2 of 2)

TB62725P/F/FN application circuit (the case of VLED>17(V) )

Example :

An unnecessary voltage in the case of VLED>17(V)

makes a voltage descend by the Zener diode.

T B 6 2 7 2 5 P / F / FN

Example) TD62M8600F

8-bit Multi-Chip PNP Tr Array,

which is not used in Static Lighting System.

C.U.

SCAN

O0 O1 O2

O5 O6 O7

O0 O1 O2

O5 O6 O7

S-IN

8-bit SIPO,Latches &

S-OUT S-IN

8-bit SIPO,Latches &

S-OUT

ENA

Constant Sink Current Drivers

ENA

Constant Sink Current Drivers

LAT

CLK

TB62725P/F/FN

LAT

CLK

TB62725P/F/FN

r2

r1

r1

r1 : Resistance for a setup of output current.

r2 : Resistance for the LED module brightness adjustment.

VLED

TB62725P/F/FN application circuit (with VLED<=17(V), the case of the over-saturation)

Example :

An over-saturation voltage makes a voltage descend by the resistance with the outside.

Condition :

1 : Turn on LED with Iout=20(mA).

2 : LED of Vf=2.5( V max).

3 : saturation voltage =0.4(V min) at Ic= 20(mA) of TB62725

4 : saturation voltage =0.25(V min) at Ic= 320(mA) of TD62M8600F

Example) TD62M8600F

Connect R1, and decrease the heat losses of the IC.

8-bit Multi-Chip PNP Tr Array,

r3= ( 15-0.4-LED Vf*1 - 0.25 ) /20mA =592.5(Ohms)

which is not used in Static Lighting System.

r3

r3

C.U.

SCAN

O0 O1 O2

O5 O6 O7

O0 O1 O2

O5 O6 O7

S-IN

8-bit SIPO,Latches &

S-OUT S-IN

8-bit SIPO,Latches &

S-OUT

ENA

Constant Sink Current Drivers

ENA

Constant Sink Current Drivers

LAT

CLK

TB62725P/F/FN

LAT

CLK

TB62725P/F/FN

r2

r1

r1

r1 : Resistance for a setup of output current.

r2 : Resistance for the LED module brightness adjustment.

VLED

marktech

optoelectronics

120 Broadway • Menands, New York 12204

Toll Free: (800) 98-4LEDS• Fax: (518) 432-7454

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