HIP4086, HIP4086A

10

FN4220.10

March 27, 2015

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Functional Description

Input Logic

NOTE: When appropriate for brevity, input and output pins will be prefixed

with an “x” as a substitute for A, B, or C. For example, xHS refers to pins

AHS, BHS, and CHS.

The HIP4086/A is a three phase bridge driver designed

specifically for motor drive applications. Three identical half

bridge sections, A, B, and C, can be controlled individually by

their input pins, ALI, AHI, BLI, BHI, and CLI, CHI (xLI, xHI) or the 2

corresponding input pins for each section can be tied together to

form a PWM input (xLI connected to xHI = xPWM). When

controlling individual inputs, the programmable dead time is

optional but shoot-thru protection must then be incorporated in

the timing of the input signals. If the PWM mode is chosen, then

the internal programmable dead time must be used.

Shoot-Thru Protection

Dead time, to prevent shoot-thru, is implemented by delaying the

turn-on of the high-side and low-side drivers. The delay timers are

enabled if the voltage on the RDEL pin is greater than 100mV.

The voltage on RDEL will be greater than 100mV for any value of

programming resistor in the specified range. If the voltage on

RDEL is less than 100mV, the delay timers are disabled and no

shoot-thru protection is provided by the internal logic of the

HIP4086/A. When the dead time is to be disabled, RDEL should

be shorted to VSS.

Refresh Pulse

To insure that the boot capacitors are charged prior to turning on

the high-side drivers, a refresh pulse is triggered when DIS is low

or when the UV comparator transitions low (VDD is greater than

the programmed undervoltage threshold). Please refer to the

“Block Diagram (for clarity, only one phase is shown)” on page 2.

When triggered, the refresh pulse turns on all of the low-side

drivers (xLO = 1) and turns off all of the high-side drivers

(xHO = 0) for a duration set by a resistor tied between RDEL and

VSS. When xLO = 1, the low-side bridge FETs charge the boot

caps from VDD through the boot diodes.

FIGURE 18. DEAD TIME

FIGURE 19. UNDERVOLTAGE THRESHOLD

JUNCTION TEMPERATURE (°C)

-60

-40

-20

0

20

40

60

80

100 120

140

160

0

2

4

6

RDEL = 100kΩ

RDEL = 10kΩ

JUNCTION TEMPERATURE (°C)

-60

-40

-20

0

20

40

60

80

100 120 140 160

6.0

6.5

7.0

7.5

8.0

8.5

9.0

9.5

10.0

10.5

11.0

ENABLE (50kΩ, UVLO TO GND)

TRIP (50k, UVLO TO GND)

ENABLE (UVLO OPEN)

TRIP (UVLO OPEN)

JUNCTION TEMPERATURE (°C)

-60

-40

-20

0

20

40

60

80

100 120 140 160

10

15

20

25