TB6596FLG Toshiba, TB6596FLG Datasheet - Page 7

• Manufacturer Part Number: TB6596FLG
• Manufacturer: Toshiba

Specifications of TB6596FLG

• Function: Driver
• Vopmax (vm*): 5.5V (6V)
• Io (lpeak): 0.6A (0.8A)
• Channel: 6-ch
• I/f: serial input
• Option: Const current x2
• Package: QON36
• Rohs Compatible†: yes

Constant-Current Bridge Driver (Channel E): PWM constant-current choppers
generated by dividing the external CLK signal. The turn-off period can be adjusted by changing either the CLK
frequency or the number of its rising edges counted (three or five counts; the default is five counts).
is sensed via an external current-sensing resistor. As the current increases, a voltage (VRF) develops across the
resistor, which is fed back to the internal comparator. At the predetermined reference voltage (Vlimit: current
limiting voltage), the comparator turns off (chops) the power supply.
internal clock signal as a turn-off period. (The counter resets at the sixth rising edge of the clock.)
transistors.
The TB6596FLG has PWM choppers with a constant turn-off period.
The turn-off period is measured by counting the number of rising edges of an internal clock signal, which is
Turning on the power supply causes a current to flow into the motor coils. The peak current through the winding
When high-side output transistors are turned off, the TB6596FLG, by default, counts five rising edges of the
Based on this turn-off period, the TB6596FLG generates a PWM signal that turns on and off the output
Timing Diagram of the PWM Constant-Current Chopper Circuit with the Default Turn-Off Period
Generated PWM
(5-bit counter)
Internal clock
(The upper limit of the coil current (IO peak) can be calculated as: IO = Vlimit/RNF.)
Coil current
Off timer
signal
Vlimit
VRF
Power on
1 2 3
4 5 6
on
7
off
Counts 5 rising edges of internal clock
on
off
on
off
TB6596FLG
2008-01-29
Power off
on