TB6607FLG Toshiba, TB6607FLG Datasheet - Page 8

• Manufacturer Part Number: TB6607FLG
• Manufacturer: Toshiba

Specifications of TB6607FLG

• Function: Driver
• Vopmax (vm*): 5.5V (6V)
• Io (lpeak): 0.6A (0.8A)
• Channel: 5-ch
• I/f: serial input
• Option: Const current x2
• Package: QON36
• Rohs Compatible†: yes

Generated PWM signal
•
•
(5-bit counter)
Internal clock
(The upper limit of the coil current (IO peak) can be calculated as: IO = V
Constant-Current Bridges (Channels D and E): PWM constant-current choppers
The TB6607FLG has PWM choppers with a constant turn-off period.
The TB6607FLG measures the turn-off period by counting the number of rising edges of the externally
applied CLK signal. The turn-off period can be changed by changing either the CLK frequency or the
number of its rising edges counted (three or five counts; the default is five counts).
Turning on the power supply causes a current to flow into the motor coils. The peak current through the
winding 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 comparator. At the predetermined reference voltage
(Vlimit), the comparator turns off (chops) the power supply.
When high-side output transistors are turned off, the TB6607FLG, by default, counts five rising edges of
the internal CK signal as turn-off period. (The counter resets at the sixth rising edge of CK.)
Based on this turn-off period, the TB6607FLG generates a PWM signal that turns on and off the output
transistors.
Timing Diagram of the PWM Constant-Current Chopper Circuit with the Default Turn-Off Period
Coil current
Input Pins
All input pins (CK, DATA, LD, PWMA-PWME, STBY) have a pull-down resistor of about 200 kΩ.
Off timer
V
VRF
limit
CK
Power on
1 2 3
4 5 6
ON
Input
200 kΩ
8
OFF
V
GND
limit
CC
ON
/RNF.)
Counts 5 rising edges of CK.
OFF
ON
TB6607FLG
OFF
2008-01-15
Power off
ON