TB6608FNG Toshiba, TB6608FNG Datasheet - Page 14

• Manufacturer Part Number: TB6608FNG
• Description: STEPPER MOTOR DRIVE, 13V 0.8A SSOP20
• Manufacturer: Toshiba

Specifications of TB6608FNG

• No. Of Outputs: 2
• Output Current: 600mA
• Output Voltage: 15V
• Supply Voltage Range: 2.7V To 5.5V, 2.5V To 13.5V
• Driver Case Style: SSOP
• No. Of Pins: 20
• Operating Temperature Range: -20°C To +85°C
• Motor Type: Stepper
• Rohs Compliant: Yes
• Function: Driver
• Vopmax (vm*): 13.5V (15V)
• Io (lpeak): 0.6A (0.8A)
• Excitation: 1/8 step
• I/f: CLK input
• Mixed Decay Mode: no
• Package: SSOP24
• Rohs Compatible†: yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Chopper Control
detected by the comparator and the power is turned off (chop off).
signal, and generates the motor-driving PWM signal based on the turn-off time of four CK cycles.
be calculated as follows:
and GND, and the other is connected between RFB and GND.
Turning on the power (chop on) causes a current to flow into the coils. Once the V
The off timer/counter counts the number of falling edges of the internal CK signal, which is derived from the OSC
OSC
Internal CK
Off timer counter
Generate PWM
Upper limit:
Coil current
The upper limit of the current across the motor coil (i.e., the peak current in each excitation mode), I (Limit), can
Vref equals to 0.125 V when TQ is Low, while it equals to 0.5 V when TQ is High.
R
Timing chart may be simplified for the sake of brevity.
NF
I (Limit) = Vref/R
is the value of resistors used for output current detection. One of those resistors is connected between RFA
Vref/R
NF
NF
chop on
off
14
on
off
RF
on
voltage reaches Vref, it is
off
TB6608FNG
2007-12-17
on