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부품번호 | LM4960SQ 기능 |
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기능 | Piezoelectric Speaker Driver | ||
제조업체 | National Semiconductor | ||
로고 | |||
전체 12 페이지수
October 2004
LM4960
Piezoelectric Speaker Driver
General Description
The LM4960 utilizes a switching regulator to drive a dual
audio power amplifier. It delivers 24VP-P mono-BTL to a
ceramic speaker with less than 1.0% THD+N while operating
on a 3.0V power supply.
The LM4960’s switching regulator is a current-mode boost
converter operating at a fixed frequency of 1.6MHz.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4960 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4960 features a low-power consumption externally
controlled micropower shutdown mode. Additionally, the
LM4960 features and internal thermal shutdown protection
mechanism along with a short circuit protection.
The LM4960 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
n VOUT @ VDD = 3.0 THD+N ≤ 1%
n Power supply range
n Switching Frequency
Features
n Stereo BTL amplifier
n Low current shutdown mode
n "Click and pop" suppression circuitry
n Low Quiescent current
n Unity-gain stable audio amplifiers
n External gain configuration capability
n Thermal shutdown protection circuitry
n Wide input voltage range (3.0V - 7V)
n 1.6MHz switching frequency
Applications
n Mobile phone
n PDA’s
Connection Diagram
LM4960SQ
24VP-P (typ)
3.0 to 7V
1.6MHz (typ)
Top View
Order Number LM4960SQ
See NS Package Number
20076582
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200765
www.national.com
Electrical Characteristics VDD = 5.0V (Notes 1, 2) (Continued)
Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature, TA. The maximum
allowable power dissipation is PDMAX = (TJMAX − TA) / θJA or the given in Absolute Maximum Ratings, whichever is lower. For the LM4960 typical application (shown
in Figure 1) with VDD = 12V, RL = 4Ω stereo operation the total power dissipation is 3.65W. θJA = 35˚C/W.
Note 4: Human body model, 100pF discharged through a 1.5kΩ resistor.
Note 5: Machine Model, 220pF–240pF discharged through all pins.
Note 6: Typicals are measured at 25˚C and represent the parametric norm.
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9: Shutdown current is measured in a normal room environment. The Shutdown pin should be driven as close as possible to VDD for minimum shutdown
current.
www.national.com
4
4페이지 Typical Performance Characteristics (Continued)
Power Dissipation vs Output Voltage
VDD = 3V, from top to bottom:
V1 = 15V, V1 = 12V, V1 = 9.6V
Power Dissipation vs Output Voltage
VDD = 5V, from top to bottom:
V1 = 15V, V1 = 12V, V1 = 9.6V
20076509
Supply Current vs Supply Voltage
from top to bottom:
VDD = 15V, VDD = 12V, VDD = 9.6V
20076510
Power Supply Rejection Ratio
VDD = 3V
20076513
Power Supply Rejection Ratio
VDD = 5V
20076511
20076512
7
www.national.com
7페이지 | |||
구 성 | 총 12 페이지수 | ||
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부품번호 | 상세설명 및 기능 | 제조사 |
LM4960SQ | Piezoelectric Speaker Driver | National Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |