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MP1720DQ-12 Datasheet(PDF) 10 Page - Monolithic Power Systems |
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MP1720DQ-12 Datasheet(HTML) 10 Page - Monolithic Power Systems |
10 / 14 page MP1720 – 2.7W LOW EMI HIGH EFFICIENCY MONO CLASS-D AUDIO AMPLIFIER MP1720 Rev. 1.01 www.MonolithicPower.com 10 8/9/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. The peak-to-peak range of limited input voltage on each input pin VLIMIT(PP) can be calculated by the DC bias voltage VBIAS as the following formula. VLIMIT (PP) = 2* (VBIAS+0.5) (1) Take the application with input coupling capacitor as an example, the input DC bias voltage VBIAS on each input pin is set internally (detailed value please see Input Bias Voltage in the EC table). For different gain options, the calculated maximum input signal and the tested maximum output power, with SE input or differential input, are shown in the Table 2. Table 2—Maximum Input voltage and Maximum Output Power Test condition:VIN=PVIN=5V; 4Ω load. SE input Differential input Part VIN_max (VPP) POUT_max (W) VIN_max (VPP) POUT_max (W) MP1720-3 2.99 0.52 5.98 1.9 MP1720-6 2.88 0.93 5.76 2.7 @ 10% THD+N MP1720-9 2.72 1.74 5.44 2.7 @ 10% THD+N MP1720- 12 2.568 2.62 5.136 2.7 @ 10% THD+N MP1720- 216 1.93 2.7 @ 10% THD+N 3.86 2.7 @ 10% THD+N Shutdown Function The MP1720 SHDN input is a low-active control. To shutdown MP1720, drive SHDN low-level voltage. To enable MP1720, drive SHDN high- level voltage. Shutdown function can place the MP1720 in a low-power (0.1μA) shutdown mode and reduce power consumption and extend battery life. Thermal Shutdown/ Short Circuit Protection The MP1720 provides internal over thermal protection and short-circuit protection. The amplifier would be disabled to prevent damage to the IC if the junction temperature surpasses +125°C. The junction temperature must fall below +112°C before normal operation resumes. The currents of both the high-side and low-side MOSFETs are measured. If the current exceeds an internally preset value, all MOSFETs will be turned off. After the over thermal or short circuit fault is monitored, the MP1720 remains disabled status for a minimum of 50μs until normal operation resumes. Pop Suppression After driving SHDN pin high, there is a 15ms Start-up time to eliminate the startup pop. During this period, an internal circuitry would charges the bias voltages of the device to a certain level to prevent the startup click or pop. And after driving SHDN pin low, the all outputs will be set to high impedance immediately |
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