UBA2030T Просмотр технического описания (PDF) - Philips Electronics

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UBA2030T

Full bridge driver IC

Philips Electronics 

Philips Semiconductors

Full bridge driver IC

Preliminary specification

UBA2030T

SYMBOL

PARAMETER

CONDITIONS

MIN. TYP.

Shut-down; note 2

VIH

HIGH-level input voltage

shut-down active; -∆----V∆----St---D-- > 5 V/ms 4.5

−

VIL

LOW-level input voltage

shut-down not active;

-∆----V∆----St---D-- > 5 V/ms

0

−

Ii(SD)

input current

0

−

Notes

1. The current into pin HV is internally limited to 15 mA at Tj = 25 °C and to 10 mA at Tj = 150 °C.

2. VDD = 15 V.

3. The bridge frequency can be calculated using Equation (1).

4. The ‘dead time’ is adjusted using an external resistor; see Equation (2).

5. This function is disabled when using an external oscillator.

6. IIH < 2.1 mA when the condition is VBE − VBER = 5 V at Tj = 150 °C.

MAX.

VDD

0.5

50

UNIT

V

V

µA

Design equations

BRIDGE COMMUTATION FREQUENCY

The internal ÷2 circuit requires the frequency of the

internal or external oscillator to be twice the bridge

frequency. When the internal oscillator is used, the bridge

frequency can be adjusted using an external resistor and

capacitor:

fbridge = 2----.--8----×-----R-----o-1-s---c---×-----C-----o--s--c-

(1)

Where:

Rosc(min) = 200 kΩ

Rosc(max) = 2 MΩ (with low leakage current).

DEAD TIME

RDT = 270 × tdead – 70

(2)

The ‘dead time’ (tdead) can be adjusted using an external

resistor (RDT) connected between DTC and SGND:

Units are kΩ for RDT and µs for tdead.

Where:

RDT(min) = 50 kΩ

RDT(max) = 1 MΩ.

1999 Aug 10

11

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