SM59A16U1
8-Bit Micro-controller
64KB with ISP Flash
& 6K+256B RAM embedded
13.12 Dead Time
When the half-bridge circuit is applying, at the same time of upper and lower arm turn state period, due to characters of
TON and TOFF, power crystal can not instantaneous complete turn state, so as to cause a short circuit, then must
spare a certain time to allow power crystal turn state.
Each pair of complementary PWM output have a 6 bit down counter, due to produce dead time as below figure Fig.
13-2, each dead time unit has a rising edge and falling edge detector, according to the counter and when the value of
number is zero, the output is just converted.
0 PRE 1)
2( DT
Td
DT 0
Fosc
Td
Td
Compare output
PWM1
PWM0
Fig. 13-2: PWM output Compare
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M071 Ver A SM59A16U1 04/12/2013
- 89 -
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
