STA506A_04 STMICROELECTRONICS | Alldatasheet
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Technical content
This is preliminary information on a new product now in development. Details are subject to change without notice.
1 FEATURES
2 DESCRIPTION
bridge (Binary mode) with half current capability. proportional to VL pin voltage. Figure 2. Application Circuit (Dual BTL) Figure 1. Package Table 1. Order Codes
Table 2. Pin Function
1 GND-SUB Substrate Ground
5 GND2B Negative Supply
6 GND2A Negative Supply
12 V CC1B Positive Supply
13 GND1B Negative Supply
14 GND1A Negative Supply
15 V CC1A Positive Supply
18 NC Not Connected
19 GND-clean Logical Ground
20 GND-reg Ground for regulator V
23 VL Logic Reference Voltage
24 CONFIG Configuration pin
25 PWRDN Stand-by pin
26 TRI-STATE High-Z pin
27 FAULT Fault pin Advisor
28 TH-WAR Thermal Warning Advisor
29 IN1A Input of Half Bridge 1A
30 IN1B Input of Half Bridge 1B
31 IN2A Input of Half Bridge 2A
32 IN2B Input of Half Bridge 2B
Table 3. Functional Pin Status (*) : The pin is open collector. To have the high logic value, it needs to be pulled up by a resistor. Figure 3. Pin Connection
Table 4. Absolute Maximum Ratings **Table 5. (*) Recommended Operating Conditions** Table 6. Thermal Data Table 7. Electrical Characteristcs: refer to circuit in Fig.1 (VL = 3.3V; VCC = 32V; RL = 8Ω;
Table 9. Logic Truth Table (see fig. 4) Table 7. (continued)
3 TECHNICAL INFO:
audio output power in high efficiency. Figure 7. STA506A Block Diagram Full-Bridge DDX® or Binary Modes Figure 8. STA506A Block Diagram Binary Half-Bridge Mode
3.1 Logic Interface and Decode:
er logic interface, the VL input must operate at the dame voltage as the DDX control logic supply.
3.2 Protection Circuitry:
drain MOSFET connected to the fault pin (pin.27) is switched on.
There are two possible modes subsequent to activating a fault: – 1) SHUTDOWN mode: with FAULT (pull-up resistor) and TRI-STATE pins independent, an activated fault will disable the device, signaling low at the FAULT output. The device may subsequently be reset to normal operation by toggling the TRI-STATE pin from High to Low to High using an external logic signal. – 2) AUTOMATIC recovery mode: This is shown in the Application Circuit of fig.1. The FAULT and TRI-STATE pins are shorted together and connected to a time constant circuit com- prising R59 and C58. An activated FAULT will force a reset on the TRI-STATE pin causing normal operation to resume fol- lowing a delay determined by the time constant of the circuit. If the fault condition is still present , the circuit operation will continue repeating until the fault condition is removed . An increase in the time constant of the circuit will produce a longer recovery interval. Care must be taken in the overall system design as not to exceed the protection thesholds under normal operation.
3.3 Power Outputs:
The STA506A power and output pins are duplicated to provide a low impedance path for the device's bridged outputs . All duplicate power, ground and output pins must be connected for proper operation. The PWRDN or TRI-STATE pins should be used to set all MOSFETS to the Hi-Z state during power-up until the logic power supply, V L , is settled.
3.4 Parallel Output / High Current Operation:
When using DDX Mode output , the STA506A outputs can be connected in parallel in order to increase the output current capability to a load. In this configuration the STA506A can provide 80W into 8 ohm or up to 120W into 4ohm. This mode of operation is enabled with the CONFIG pin (pin.24) connected to Vdd and the inputs combined IN1A=IN1B, IN2A=IN2B and the outputs combined OUT1A=OUT1B, OUT2A=OUT2B.
3.5 Additional Informations:
Output Filter: A passive 2nd-order passive filter is used on the STA506A power outputs to reconstruct an analog Audio Signal . System performance can be significantly affected by the output filter design and choice of passive components. A filter design for 6ohm/8ohm loads is shown in the Typical Application circuit of fig.1. Figure 9 shows a filter design suitable for 4ohm loads. Figure 10 shows a filter for ½ bridge mode , 4 ohm loads.
3.6 Power Dissipation & Heat Sink Requirements:
The power dissipated within the device will depend pr imarily on the supply voltage, load impedance and output modulation level. The PowerSO36 package of the STA506A includes an exposed thermal slug on the top of the device to provide a direct thermal path from the IC to the heatsink. Careful consideration must be given to the overall thermal design . See figure 8 for power derating versus Slug temperature using different heatsinks and considering the Rth-jc =1.5°C/W.
Figure 9. STA506A Power Derating Curve Figure 10. Typical Single BTL Configurationto Obtain 120W @ THD 10%, RL= 4Ω, VCC = 32V (note 1))
11 OUT1B
3 OUT2B
9 OUT2A
Figure 11. Typical Quad Half Bridge Configuration
Figure 16. Power SO36 (Slug Up) Mechanical Data & Package Dimensions (1) “D and E1” do not include mold flash or protusions. (2) No intrusion allowed inwards the leads.
Table 11. Revision History
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publicati on are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners DDX is a trademark of Apogee tecnology inc. © 2004 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America STA506A