0V

5V

0V

IN

OUT

20%

80%

80%

20%

80%

80%

OUT

(a)

( b)

t

t

F

R

IN

t

t

V

R

F

TH

UCC27321, UCC27322

UCC37321, UCC37322

SLUS504H – SEPTEMBER 2002 – REVISED JANUARY 2016

www.ti.com

7.6 Switching Characteristics

over operating free-air temperature range (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ENABLE (ENBL)

(1)

60

90

ns

(1)

60

90

ns

20

70

ns

20

30

ns

25

70

ns

35

70

ns

(1)

See Figure 2.

(2)

See Figure 1 for switching waveforms.

7.7 Power Dissipation Ratings

Power Rating

Derating Factor

PACKAGE

SUFFIX

θjc (°C/W)

θja (°C/W)

(mW)

Above

(1)

SOIC-8

D

42

PDIP-8

P

49

110

500

9

MSOP PowerPAD-8

DGN

4.7

50 to 59

1370

17.1

(1)

125°C operating junction temperature is used for power rating calculations

(2)

The range of values indicates the effect of the printed-circuit-board. These values are intended to give the system designer an indication

of the best and worst case conditions. In general, the system designer should attempt to use larger traces on the printed-circuit-board

where possible to spread the heat away form the device more effectively. For additional information on device temperature

management, see the Packaging Information section of the Power Supply Control Products Data Book, (SLUD003).

The 20% and 80% thresholds depict the dynamics of the BiPolar output devices that dominate the power MOSFET

transition through the Miller regions of operation.

Figure 1. Switching Waveforms for (a) Inverting Input to (b) Output Times

6

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