sta5150 STMicroelectronics, sta5150 Datasheet - Page 10

• Manufacturer Part Number: sta5150
• Description: 200w Mono Bash Power Amplifier
• Manufacturer: STMicroelectronics

STA5150
Figure 3. Power Protection Block Diagram
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:
for P
Independently of the output voltage, the chip is also shut down in the folowing conditions:
When the currentthrough the sensing resistor, R
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
The output bridge is muted when the average junction temperature reaches 130°C.
10/14
d
CD+P
< P
d_av_th
OPA
OUTP
R
the I
SENSE
prot
= 0
CD+
CD-
V/I
V/I
MULTIPLIER
ILOAD
I_PD
|
Vs+
I
prot
| +
OUTP
|Vs-| <20V
OPA
X
----------------------------------------------------------------- -
P
sense
d
–
P
, reaches 14A (Voltage drop (CD+) - (CD+1) = 700mV).
d_av _th
1.25V
IPDP
IPDA
ILIM
IPD
IPD
5 10
–
CURRENT COMP
CURRENT COMP
4
D01AU1282
IPROT
PDP1
OC1
TO TURN-ON/OFF
SEQUENCE
TO TURN-ON/OFF
SEQUENCE
TO PROT PAD