A timing control circuit (70) generates staggered signals from a pulse
width modulated signal (68) providing lossless switching in a DC to DC
power converter (10). The DC to DC power converter (10) comprises two
input MOSFET switches (22, 28) coupled to primary windings (34) of an
isolation transformer (36) and two output MOSFET switches (38, 50)
coupled to secondary windings (48) of the isolation transformer. The
timing circuit (70) comprises an input terminal (90) for receiving a
pulse width modulated signal (68) that switches low at time t1 and high
at time t4. A first timing output signal circuit (92) is responsive to
the pulse width modulated signal (68) and provides a first timing output
signal (72) that switches low at time t1 and high at time t7 to control
one of the input MOSFET switches (22). A second timing output signal
circuit (94) is responsive to the pulse width modulated signal (68) and
provides a second timing output signal (76) that switches high at time t3
and low at time t6 to control the other input MOSFET switch (28). A third
timing output signal circuit (96) is responsive to the pulse width
modulated signal (68) and provides a third timing output signal (82) that
switches low at time t2 and high at time t5 to control one of the output
MOSFET switches (50). A fourth timing output signal circuit (98) is
responsive to the pulse width modulated signal (68) and provides a fourth
timing output signal (86) that switches high at time t2 and low at time
t8 to control the other of the output MOSFET switches (38). The times t1
through t8 occur in sequence.