STA518 データシートの表示（PDF） - STMicroelectronics
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STA518 Datasheet PDF : 19 Pages
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Technical information
4
Technical information
STA518
The STA518 is a dual channel H-Bridge that is able to deliver 50W per channel (@
THD=10% RL = 8Ω,
VCC = 29V) of audio output power in high efficiency.
The STA518 converts both DDX and binary-controlled PWM signals into audio power at the
load. It includes a logic interface , integrated bridge drivers, high efficiency MOSFET outputs
and thermal and short circuit protection circuitry.
In DDX mode, two logic level signals per channel are used to control high-speed MOSFET
switches to connect the speaker load to the input supply or to ground in a Bridge
configuration, according to the damped ternary Modulation operation.
In Binary Mode operation , both Full Bridge and Half Bridge Modes are supported. The
STA518 includes over-current and thermal protection as well as an under-voltage
Lockout with automatic recovery. A thermal warning status is also provided.
Figure 6. STA518 Block Diagram Full-Bridge DDX® or Binary Modes
INL[1:2]
INR[1:2]
VL
PWRDN
TRI-STATE
FAULT
TWARN
Logic I/F
and Decode
Left
H-Bridge
Protection
Circuitry
Regulators
Right
H-Bridge
OUTPL
OUTNL
OUTPR
OUTNR
Figure 7. STA518 Block Diagram Binary Half-Bridge Mode
INL[1:2]
INR[1:2]
VL
PWRDN
TRI-STATE
FAULT
TWARN
Logic I/F
and Decode
Protection
Circuitry
Regulators
LeftA
‰-Bridge
LeftB
‰-Bridge
RightA
‰-Bridge
RightB
‰-Bridge
OUTPL
OUTNL
OUTPR
OUTNR
4.1
12/19
Logic interface and decode:
The STA518 power outputs are controlled using one or two logic level timing signals. In
order to provide a proper logic interface, the Vbias input must operate at the dame voltage
as the DDX control logic supply.
Protection circuitry:
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