mic4102 Micrel Semiconductor, mic4102 Datasheet - Page 8

• Manufacturer Part Number: mic4102
• Description: 100v Half Bridge Mosfet Driver With Anti-shoot Through Protection
• Manufacturer: Micrel Semiconductor

Timing Diagrams
Time Point Action
1-2
2-4
5-7
Micrel, Inc.
November 2006
PWM signal goes high. This initiates the LO
signal to go low. The delay between PWM high to
(V
LO goes low. When LO reaches 1.7V (V
low side MOSFET is deemed to be off. The high
side output HO then goes high. The delay
between 3 and 4 is typically 30ns (T
allows for large turn off delay times of MOSFETs.
PWM goes low; HO goes low, typically within
45ns, t
monitored; when the switch node is VDD-2.5V
(V
off and the LO output goes high within typically
30ns (t
remains high until PWM goes high. This is
Switch node
LO
SWTH
(HS Pin)
HO
LO
LS
PWM
–10%) is typically 30ns (t
t
60ns
30ns
) the high side MOSFET is deemed to be
LOOFF
LOON
HOOFF
t
30ns
60ns
HOON
). This is controlled by a one shot and
1
. The switch node (HS pin) is then
2
3. V
4
LOOFF
<1.7V
LOOFF
t
70ns
45ns
HOOFF
70ns
30ns
t
LOON
)
5
HOON
LOOFF
6
7. V
); this
) the
SWth
8
<(VDD-2.5V)
8
8-10
because it is possible to have the SW node
oscillate, and could easily bounce through 10V
level. If the LO high transition has not happened
within 250ns, it is forced to happen, unless the LS
input is low.
If at any time after 7 has occurred and LS pin
goes low, the LO output will turn off within 36ns
(V
overrides all shoot through control logic. If LS is
low at the start of the next cycle when PWM
signal goes high then HO shall switch transition
1-4 as normal. I.e. PWM signal equals HO output,
LO = 0V.
LSOFF
).
HO will remain off. The LS pin
t
70ns
36ns
LSOFF
9
10
M9999-112806
MIC4102