STA5150 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STA5150

200W MONO BASH POWER AMPLIFIER

STMicroelectronics 

STA5150

Figure 3. Power Protection Block Diagram

CD+P

RSENSE

CD+

ILOAD

V/I

OC1

TO TURN-ON/OFF

SEQUENCE

ILIM

CURRENT COMP

OPA

MULTIPLIER X

V/I

I_PD

OPA

IPD

IPDP

IPD

IPDA

PDP1

CURRENT COMP

TO TURN-ON/OFF

SEQUENCE

IPROT

TO PROT PAD

OUTP

CD-

OUTP

D01AU1282

In fig. 4 there is the power protection strategy pictures. Under the curve of the 64W power, the chip is in normal

operation, over 120W the chip is forced in Standby. This last status would be reached if the digital converter

does not respond quikly enough reducing the stress to less than 120W.

The fig.5 gives the protection current, Iprot, behavior. The current sourced by the pin Prot follows the formula:

Iprot ≡ -(--P----d----–-----P----d---_---1a---v.--2-_--5-t-h--V--)----⋅---5-----⋅---1---0----–--4-

for Pd < Pd_av_th the Iprot = 0

Independently of the output voltage, the chip is also shut down in the folowing conditions:

When the currentthrough the sensing resistor, Rsense, reaches 14A (Voltage drop (CD+) - (CD+1) = 700mV).

When the average junction temperature of the chip reaches 150°C.

When the ground potential differ from more than 5V from the half of the power supply voltage, ((CD+)-(CD-))/2

When the sum of the supply voltage |Vs+| + |Vs-| <20V

The output bridge is muted when the average junction temperature reaches 130°C.

10/14

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