lv8130v Sanyo Semiconductor Corporation, lv8130v Datasheet - Page 14

• Manufacturer Part Number: lv8130v
• Description: For Brushless Motor Drive Direct Pwm Drive, Quiet Predriver Ic
• Manufacturer: Sanyo Semiconductor Corporation

3. Synchronous Rectification
Waveform Example (4)
Waveform Example (5)
This IC performs synchronous rectification by setting the SR pin to high or open. Synchronous rectification sets the
lower output FET to on when PWM is off (high side = OFF). This causes regenerative current to flow to the FET
instead of the diode, so the loss during regeneration can be reduced by establishing the relationship Vf > ON resistor ×
Regenerative current.
The IC pre-output has an output delay time of approx. 4μs between the high side off and the low side on, but a through
current flows according to the output stage delay time, so this must be investigated.
1
2
3
4
1
2
3
4
5ms
5.0V
5ms
10.0V
5ms
10.0V
5ms
10.0V
20μs
5.0V
20μs
10.0V
20μs
2.00V
20μs
10.0V
ON⇒OFF
OFF
Di regeneration
1
Synchronous Rectification
2
P = Vf × I
ON
LV8130V
PRE-L
PRE-L
PRE-H
OUT
OUT
PRE-H
1
2
3
4
1
2
3
4
20μs
5.0V
20μs
10.0V
20μs
10.0V
20μs
10.0V
20μs
5.0V
20μs
10.0V
20μs
2.00V
20μs
10.0V
OFF⇒ON
ON⇒OFF
Synchronous Rectification
Enlarged diagram
1
P = Ron × I
High efficiency
2
2
No.A1708-14/19
ON