MIC4102 datasheet(12/28 Pages) MICROCHIP

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MIC4102

DS20005575A-page 12

 2016 Microchip Technology Inc.

4.0

TIMING DIAGRAM

FIGURE 4-1:

MIC4102 Timing Diagram.

TABLE 4-1:

TIME POINTS AND ACTIONS FOR Figure 4-1

Time Point

Action

1-2

PWM signal goes high. This initiates the LO signal to go low. The delay between PWM high to

(VLO – 10%) is typically 30 ns (tLOOFF).

2-4

LO goes low. When LO reaches 1.7V (VLOOFF) the low-side MOSFET is deemed to be off. The

high-side output HO then goes high. The delay between 3 and 4 is typically 30 ns (THOON); this

allows for large turn off delay times of MOSFETs.

5-7

PWM goes low; HO goes low, typically within 45 ns, tHOOFF. The switch node (HS pin) is then

monitored; when the switch node is VDD – 2.5V (VSWTH) the high-side MOSFET is deemed to be

off and the LO output goes high within typically 30 ns (tLOON). This is controlled by a one shot

and remains high until PWM goes high. This is 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 250 ns, it is forced to happen, unless the LS input is low.

8-10

If at any time after 7 has occurred and LS pin goes low, the LO output will turn off within 36 ns

(VLSOFF). HO will remain off. The LS pin 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).

LOOFF

30ns

60ns

PWM

Switchnode

(HSPin)

3 V

LOOFF < 1.7V

7 V

SWth < (VDD – 2.5V)

HOON

30ns

60ns

HOOFF

45ns

70ns

LOON

30ns

70ns

LSOFF

36ns

70ns

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