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LM4961 Datasheet(PDF) 10 Page - Texas Instruments |
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LM4961 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 24 page Shutdown 1 GND 12 6 GND 7 11 4 SW VDD L1 10 PH FB 8 470 pF 13k SW-Out 1 68k Shutdown 1 Band-SW 19 Band-SW Shutdown 2 3 Shutdown 2 4.7 PF SW GND 28 Vamp 26 1.0 PF GND 24 1.0 PF Bypass 2 15 VO2 27 15 VO1 23 2 PF Ceramic 20k Cchg 17 VIN 18 0.1 PF Audio In 20k 2000 pF 200k 82 pF BW2 BW1 21 20 VDD 42k 6800 pF VI = VFB(1 + R2/(R3 + 170)) Load C2 1 PF R2 D1 CF R3 CO1 CBYPASS Ci Ri CF3 RF3 CF1 CF2 RF1 RF2 CS2 Rc 1k C3-1 0.01 PF RC3-1 20k RC2-1 4.7 C2-1 4.7 PF LM4961, LM4961LQBD SNAS242K – AUGUST 2004 – REVISED MAY 2013 www.ti.com Figure 20. Transient Current Spike Reduction Configuration PROPER SELECTION OF EXTERNAL COMPONENTS Proper selection of external components in applications using integrated power amplifiers, and switching DC-DC converters, is critical for optimizing device and system performance. Consideration to component values must be used to maximize overall system quality. The best capacitors for use with the switching converter portion of the LM4961 are multi-layer ceramic capacitors. They have the lowest ESR (equivalent series resistance) and highest resonance frequency, which makes them optimum for high frequency switching converters. When selecting a ceramic capacitor, only X5R and X7R dielectric types should be used. Other types such as Z5U and Y5F have such severe loss of capacitance due to effects of temperature variation and applied voltage, they may provide as little as 20% of rated capacitance in many typical applications. Always consult capacitor manufacturer’s data curves before selecting a capacitor. High-quality ceramic capacitors can be obtained from Taiyo-Yuden. POWER SUPPLY BYPASSING As with any amplifier, proper supply bypassing is critical for low noise performance and high power supply rejection. The capacitor location on both V1 and VDD pins should be as close to the device as possible. 10 Submit Documentation Feedback Copyright © 2004–2013, Texas Instruments Incorporated Product Folder Links: LM4961 LM4961LQBD |
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