TA84002F Toshiba Semiconductor, TA84002F Datasheet - Page 4

• Manufacturer Part Number: TA84002F
• Description: TOSHIBA BIPOLAR LINEAR INTEGRATED CIRCUIT MULTI-CHIP
• Manufacturer: Toshiba Semiconductor

PWM CURRENT CONTROL
Output current is sensed and cotrolled independently in each bridge by an external sense resistor (RFN), internal
comparator, and mono−stable multi−vibrator.
When the bridge is turn ON, current increases in the motor winding and flows through the external sense resistor
until the sense voltage (VNF) reaches the level set at the comparator’ s input: V
The comparator then triggers the mono−stable, which turn OFF the lower transistor of the bridge.
The OFF time is determined by the mono−stable’ s external RC timing components.
The value of the current limiting (I
t
I
OFF
O
= (V
≈ 1.1 CR
ref
/ 5) / RNF−0.05
O
) is approximated by
4
ref
/ 5
TA84002F
2001-09-06