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NCP3011, NCV3011
Master/Slave Synchronization
The SYNC pin performs two functions. The first function
is to identify if the device is a master or a slave. The second
function is to either synchronize to an external clock
(Slave Mode) or provide an external clock that is shifted by
180 ° from the high side switch (Master Mode). The typical
application circuit for this is shown in Figure 29.
HSDR
MASTER
VIN
SYNC 1
VIN
SYNC 2
SLAVE
HSDR
60k W
Figure 29. Master Slave Typical Application
ISYNC TRIP
Upon initial power up, the device determines if it is a
Master or Slave by applying 1.25 V to the SYNC pin and
determining whether the current draw from the pin is greater
than the Master Threshold Current (ISYNC TRIP ). If
ISYNC TRIP is exceeded then the device enters master mode.
If the current is less than ISYNC TRIP the device enters slave
mode. Once identified as a Master, the device switching
SYNC ref
R Master +
R Master = Master Select Resistor ( W )
SYNC ref = Sync Reference Voltage (V)
ISYNC TRIP = Master Threshold Current (A)
(eq. 2)
frequency is increased by 15%. See Equation 2.
Master
HSDRV
0 ? 50%
Duty
Cycle
Slave
HSDRV
Pulse
Detect
Master
Detection
Hold
Result
0 ? 50%
Duty
Cycle
Vref = 1.25 V
SYNC1
Voltage
Vref = 1.25 V
SYNC 2
Voltage
Time > 40 m s
40 m s
Time > 40 m s
I TRIP = 10 m A
SYNC 1
Current
SYNC 2
Current
Indication
of Master
Indication
of Slave
0 m A
Slave Pull
Down Turn on
Input
Voltage
Figure 30. Master Slave Typical Waveforms
http://onsemi.com
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