14

HIP4080

HIP4080 Power-up Application Information

The HIP4080 H-Bridge Driver IC requires external circuitry to

assure reliable start-up conditions of the upper drivers. If not

addressed in the application, the H-Bridge power MOSFETs

may be exposed to shoot-through current, possibly leading to

MOSFET failure. Following the instructions below will result in

reliable start-up.

The HIP4080 does not have an input protocol like the HIP4081

that keeps both lower power MOSFETs off other than through

the DIS pin. IN+ and IN- are inputs to a comparator that control

the bridge in such a way that only one of the lower power

devices is on at a time, assuming DIS is low. However, keeping

both lower MOSFETs off can be accomplished by controlling

the lower turn-on delay pin, LDEL, while the chip is enabled, as

the lower turn-on delays through the input comparator and will

keep the lower MOSFETs off. With the lower MOSFETs off and

the chip enabled, i.e. DIS = low, IN+ or IN- can be switched

through a full cycle, properly setting the upper driver outputs.

Once this is accomplished, LDEL is released to its normal

operating point. It is critical that IN+/IN- switch a full cycle while

LDEL is held high, to avoid shoot-through. This start-up

procedure can be initiated by the supply voltage and/or the chip

enable command by the circuit in Figure 32.

VOLTAGE

(LESS QUIESCENT COMPONENT) vs

FREQUENCY AND GATE LOAD CAPACITANCE

FIGURE 30. HIGH VOLTAGE LEVEL-SHIFT CURRENT vs

FREQUENCY AND BUS VOLTAGE

FIGURE 31. MINIMUM DEAD-TIME vs DEL RESISTANCE

6

7

8

9

10

11

12

13

14

15

16

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

1

10

100

1000

2

5

20

50

500

200

0.1

1

10

100

500

50

5

0.5

200

20

2

0.2

SWITCHING FREQUENCY (kHz)

3,000

1,000

10,000

100

1

10

100

1000

2

5

20

50

200

500

1

10

100

1000

2

5

20

50

200

500

SWITCHING FREQUENCY (kHz)

60V

40V

80V

20V

10

50

100

150

200

250

0

30

60

90

120

150

HDEL/LDEL RESISTANCE (k

Ω)

HIP4080