UBA2080AT Просмотр технического описания (PDF) - NXP Semiconductors.

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производитель

UBA2080AT

Half-bridge driver IC

NXP Semiconductors. 

NXP Semiconductors

UBA2080; UBA2080A; UBA2081

Half-bridge driver IC

7.4 UBA2081 non-overlap time

The external resistor (RSD) on pin SD sets the non-overlap time of the UBA2081. The

relationship between this resistor value and actual dead-time is listed in Figure 6.

It is essential to add a 10 nF to 100 nF decoupling capacitor across RSD to ensure a noise

immune dead-time system.

3000

tno

(ns)

2000

aaa-001135

1000

0

0

1

2 RSD (MΩ) 3

Fig 6. Non-overlap time versus SD resistor (RSD)

7.5 UBA2081 shutdown protection

When the voltage at pin SD is pulled below VIH, the internal sink drivers of the pins GL and

GH are immediately enabled to switch off the external power MOSFETs.

The shutdown comparator has a hysteresis of Vhys(SD) to avoid multiple switching.

Preferably, pin SD is pulled low via a collector of a transistor (see application schematic)

to avoid loading of this pin (Influences the non-overlap time settings) at normal operation.

7.6 UBA2080 overlap protection

The internal logic takes care that the GL driver and GH driver are both set to LOW in this

situation to avoid that HIN = LIN = 1 causes a cross current in the external half-bridge.

7.7 UBA2080A select function

Pin SEL enables the selection of either the UBA2080 or the UBA2081 functionality.

SEL = 0 gives the UBA2080 functionality. SEL = VDD gives the UBA2081 functionality.

UBA2080_UBA2081

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 3 — 18 June 2012

© NXP B.V. 2012. All rights reserved.

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