TB6559FG Toshiba, TB6559FG Datasheet - Page 8

• 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

Constant-Current Regulation
using a peak current detection technique.
When the V
Internal clock
(1)
(2)
Vref/6
Constant-current chopping
When V
After four cycles of CK, an internal clock generated by OSC, the regulator moves from Discharge mode
to Charge mode.
Changing the predefined current (during deceleration)
When V
later, the regulator exits Discharge mode and enters Charge mode. If V
Charge mode, however, it then reenters Discharge mode. Four CK cycles later, V
against V
V
OSC
GND
ref
Internal clock
ref
/6.
voltage is kept constant, the constant current regulator keeps the output current constant by
RS
RS
ref
Vref/6
OSC
GND
reaches the reference voltage (V
reaches the reference voltage (V
V
/6. If V
RS
V
Vref/6
RS
RS
V
RS
< V
ref
/6, the regulator enters and remains in Charge mode until V
Discharge
Discharge
Coil current
Coil current
ref
ref
8
), the regulator enters Discharge mode.
/6), the regulator enters Discharge mode. Four CK cycles
Charge
Charge
Discharge
Discharge
RS
Charge
> V
ref
/6 when it enters
RS
is again compared
TB6559FG
2009-04-14
RS
reaches