参数资料
型号: LV8130V
厂商: SANYO SEMICONDUCTOR CO LTD
元件分类: 运动控制电子
英文描述: BRUSHLESS DC MOTOR CONTROLLER, 0.05 A, PDSO30
封装: SSOP-30
文件页数: 6/19页
文件大小: 520K
代理商: LV8130V
LV8130V
3. Synchronous Rectification
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. 4
μs 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.
Waveform Example (4)
5ms
5.0V
1
5ms
10.0V
2
5ms
10.0V
3
5ms
10.0V
4
20
μs
5.0V
1
20
μs
10.0V
2
20
μs
10.0V
3
20
μs
10.0V
4
Synchronous Rectification
Enlarged diagram
PRE-H
PRE-L
OUT
Waveform Example (5)
Di regeneration
Synchronous Rectification
20
μs
5.0V
1
20
μs
10.0V
2
20
μs
2.00V
3
20
μs
10.0V
4
20
μs
5.0V
1
20
μs
10.0V
2
20
μs
2.00V
3
20
μs
10.0V
4
2
1
ON
OFF
ON
2
1
ON
OFF
ON
PRE-H
OUT
PRE-L
P = Vf
× I
P = Ron
× I2
High efficiency
No.A1708-14/19
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