TB6674PG/FG/FAG
Undervoltage Lockout Circuit(UVLO)
The TB6674 incorporates an under voltage lockout circuit.
Outputs are turned off (Hi-Z) under the conditions as follows;
VCC ≤ 4.0 V (Design target) or
VS1A ≤ 6.0 V (Design target) and VS1B ≤ 6.0 V (Design target) or
VS2A ≤ 2.2 V (Design target)
The UVLO circuit has a hysteresis and the function recovers under the conditions as follows;
VCC = 4.1 V (Design target), VS1A/ VS1B = 6.5 V (Design target), VS2A = 2.3 V (Design target)
<UVLO operation>
4.1 V (design target only)
Vcc voltage
4.0 V (design target only)
H
UVLO internal signal
L
UVLO operation
H
Output pin
L
Normal operation
OFF(Hi-Z)
<UVLO operation>
6.5 V (design target only)
Vs1A, Vs1B voltage
6.0 V (design target only)
H
UVLO internal signal L
UVLO operation
H
Output pin
L
Normal operation
OFF(Hi-Z)
6
Ver.3 2010-07-07