TB6559FG Toshiba, TB6559FG Datasheet - Page 9

• 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

method. It should be noted that the average current value changes, depending on the motor characteristics.
Calculation of the Internal Oscillation Frequency
Reference Voltage Generator
The average current value becomes lower than the set current value because of the peak current detection
The OSC oscillation frequency can be approximated by the following equation:
In constant-current mode, the peak current is determined by the V
(3)
f
I
OSC
O
= V
Changing the predefined current (during acceleration)
Even when the reference voltage is increased, the regulator remains in Discharge mode for four CK
cycles and then it enters Charge mode.
Internal clock
OUT1
= 1/{0.523 × (C
ref
/RS × 1/6 [A]
Vref/6
OSC
GND
RS
V
I
RS
M
O
OSC
I
O
[F] × 3700 + C
OUT2
V
CC
Discharge
Control circuit
Coil current
OSC
[F] × 600)} [Hz]
9
Charge
1/6
ref
voltage, as follows:
Vref
Discharge
TB6559FG
2009-04-14