TB6559FG Toshiba, TB6559FG Datasheet - Page 12

• Manufacturer Part Number: TB6559FG
• Manufacturer: Toshiba

Specifications of TB6559FG

• Functions: Driver
• Vopmax (vm*): 30V (50V)
• Io (lpeak): 1A (2.5A)
• Channel: 1-ch
• Pwm Drive: direct PWM & constant current PWM
• Package: HSOP16
• Rohs Compatible†: yes

Overcurrent Protection Circuit (ISD)
in at least one of the transistors, the overcurrent protection circuitry turns all transistors off.
turned off. After 50 μs, the protection circuitry turns the output transistors back on again automatically. If the
overcurrent persists, the device begins cycling into and out of thermal shutdown. To prevent false detection due
to glitches, the overcurrent protection circuitry turns off the transistors only when the current exceeds the
shutdown threshold for 10 μs or longer.
The TB6559FG allows for the sensing of the current that flows through each output transistor.
The currents through each of the output transistors are continually monitored. In the event of an overcurrent
The overcurrent protection circuitry incorporates a timer to measure 50 μs (typ.) after the transistors are
The design target value for current limiting is 5.0 A (typ.) but has variations between 4.0 to 6.0 A.
<Overcurrent Protection>
Output current
ALERT output
I
LIM
H
L
0
Not detected
10 μs
(typ.)
50 μs
(typ.)
OFF
12
10 μs
(typ.)
50 μs
(typ.)
OFF
TB6559FG
2009-04-14