TB6557FLG(EL) Toshiba, TB6557FLG(EL) Datasheet - Page 7

• Manufacturer Part Number: TB6557FLG(EL)
• Description: IC DC MOTOR DRIVER 36QON
• Manufacturer: Toshiba

Specifications of TB6557FLG(EL)

• Applications: DC Motor Driver, H Bridge
• Number Of Outputs: 6
• Current - Output: 600mA
• Voltage - Load: 2.5 V ~ 13.5 V
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-QON
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: TB6557FLGTR

Generated PWM
Inductor current
•
•
10-bit counter
Internal clock
Constant-current bridge block (H-SW E, F): Description of PWM constant-current chopping
generated with the external current detection resistor reaches the comparator reference voltage, Vlimit
(current limit), the comparator starts operating (Chop off). After the output Hi-side transistor is turned off,
counting for the chop-off time starts at the next rising edge of the internal clock, producing a chop-off time of
clock cycles for nine bits (reset at the rising edge for the 10th bit).
Conceptual diagram for PWM chopping operation
Others
200 kΩ)
Off timer
Turning on the power (Chop on) causes current to flow into the load inductor. Once the voltage (VRF)
This chop-off time control creates a PWM signal to turn the output transistor on and off.
Each input pin (CK, DA, LD, PWM-A, B, C, D, E, F, and STBY) has a built-in pull-down resistor (approx.
VLimit
OSC
Input
(The inductor current (I
Power on
CK
1 2 3 4 5 6
200 kΩ
(A single OSC cycle generates
a single clock cycle.)
chop on
O
peak) is limited by the value obtained from the expression I
V
GND
CC
7
9 rising edges of clock count 9 bits.
off
on
off
TB6557FLG
O
= Vlimt/RNF.)
on
Power off
2006-6-26