TDA6120 데이터 시트보기 (PDF) - Philips Electronics

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TDA6120

Video output amplifier

Philips Electronics 

Philips Semiconductors

Video output amplifier

Product specification

TDA6120Q

TEST AND APPLICATION INFORMATION

Dissipation

Regarding dissipation, distinction must be made between

static dissipation (independent of frequency) and dynamic

dissipation (proportional to frequency). The static

dissipation of the TDA6120Q is due to supply currents, and

currents in the feedback network and CRT.

The static dissipation is given by the following equation:

Pstat = VCC × ICC + VDD × IDD

– VOUTC × V-----O--R--U--f-T---C-- – VOUTC × IOUTC

Where:

Rf = feedback resistance

IOUTC = DC cathode current.

The dynamic dissipation is given by the following equation:

Pdyn = VDD × (CL + Cint) × f × VOUTC(p-p) × b

Where:

CL = load capacitance

Cint = effective internal load capacitance

(approximately 7 pF)

f = frequency

VOUTC(p-p) = output voltage (peak-to-peak value)

b = non-blanking duty cycle (0.8).

The IC must be mounted on the picture tube base

printed-circuit board to minimize the load capacitance CL.

Switch-off

The TDA6120Q is equipped with a switch-off circuit to

guarantee a controlled switch-off behaviour of the output

pins. The switch-off function is activated when the low

supply voltage (VCC) drops below a reference level

(VCC(sw)). Then the voltage at output pins OUT and OUTC

is pulled to the high supply voltage level (VDD),

independant of input pin voltage levels.

2000 Dec 13

11

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