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PAM8615RHR Datasheet(PDF) 11 Page - Power Analog Micoelectronics |
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PAM8615RHR Datasheet(HTML) 11 Page - Power Analog Micoelectronics |
11 / 13 page 11 , Power Analog Microelectronics Inc www.poweranalog.com Using low-ESR Capacitors Short-circuit Protection Thermal Protection Master-Slave and SYNC Operation L o w - E S R c a p a c i t o r s a r e r e c o m m e n d e d throughout this application section. A real (with respect to ideal) capacitor can be modeled simply as a resistor in series with an ideal capacitor. The voltage drop across this resistor minimizes the beneficial effects of the capacitor in the circuit. The lower the equivalent value of this resistance the more the real capacitor behaves as an ideal capacitor. The PAM8615 has short circuit protection circuitry on the outputs to prevent damage to the device when output-to-output shorts (BTL mode), output- to-GND shorts, or output-to-VCC shorts occur. Once a short-circuit is detected on the outputs, the output drive is immediately disabled. This is a latched fault and must be reset by cycling the voltage on the SD pin to a logic low and back to the logic high state for normal operation. This will clear the short-circuit flag and allow for normal operation if the short was removed. If the short was not removed, the protection circuitry will again activate. Thermal protection on the PAM8615 prevents damage to the device when the internal die temperature exceeds 160°C. There is a ±15 degree tolerance on this trip point from device to device. Once the die temperature exceeds the set thermal point, the device enters into the shutdown state and the outputs are disabled. This is not a latched fault. The thermal fault is cleared once the temperature of the die is reduced by 40°C. The device begins normal operation at this point without external system intervention. The MS/SL and SYNC terminals can be used to synchronize the frequency of the class-D output switching. When the MS/SL is high or left floating due to the internal pull up resistor, the switching frequency is determined by the ROSC. The SYNC becomes an output whose source/sink current is about 0.5mA, and the frequency of this output is also determined by the ROSC. And this output can be co nne cte d to a noth er PAM8 615 w ho is co n f ig u re d in t h e sla ve m o d e . Th e o u tp u t switching is synchronized to avoid any beat frequencies that occur in the audio band when two Class-D amplifiers in the same system are switching at the slight different frequencies. When the MS/SL is low, the switching frequency is determined by the incoming square wave on the SYNC input. The SNYC becomes an input in this mode and accept a square wave from another PAM8615 configured in the master mode or from an external GPIO. (Key: MS/SL=”H”, Master Mode, MS/SL=”L”, Slave Mode) PAM8615 16W/32W Stereo Class-D Audio Power Amplifier 02/2012 Rev1.1 OUT_L L 1 1 2 CB1 C1 0 OUT_R L 2 1 2 CB2 C2 0 MS/SL SYNC Rosc INL INR PAM8615 (Master) "H"=Master L 3 1 2 OUT+ C3 0 OUT- L 4 1 2 C4 0 IN- IN+ PAM8615 (Slave) SYNC MS/SL Rosc GND=Slave Rosc Rosc 0 |
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