NJU8755 PDF даташит
Спецификация NJU8755 изготовлена «ETC» и имеет функцию, называемую «Analog Signal Input Stereo Class D Power Amplifier». |
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Детали детали
Номер произв | NJU8755 |
Описание | Analog Signal Input Stereo Class D Power Amplifier |
Производители | ETC |
логотип |
6 Pages
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NJU8755
PRELIMINARY
Analog Signal Input Stereo Class D Power Amplifier
! GENERAL DESCRIPTION
The NJU8755 is an analog signal input stereo class D
power amplifier. The NJU8755 includes Inversion
operational amplifier input circuit, PWM modulators, an
output-short protector and a low voltage detector. The
NJU8755 incorporates BTL amplifiers, which eliminate
AC coupling capacitors, capable of driving up to
1.2W/channel with simple external LC low-pass filters.
Class-D operation achieves high power-efficiency,
which achieves longer battery life for battery powered
applications, thus the NJU8755 is suited for portable
audio, note-PC, etc.
! PACKAGE OUTLINE
NJU8755V
! FEATURES
! PIN CONFIGURATION
#
#
#
#
#
#
#
#
2-Channel Analog Signal Input
2-Channel BTL Outputs :1.2W/channel
Standby(Hi-Z), Mute Control
Built-in Short Protector
Built-in Low Voltage Detector
Operating Voltage
2.7 ~ 5.25V
CMOS Technology
Package Outline
SSOP20
at
5V
into
8Ohms
VDD
INL
TEST
MUTE
VDDL
OUTLP
VSSL
OUTLN
VDDL
! BLOCK DIAGRAM
VDD
VDDL
VSS
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
INL
COM
INR
-
+
Pulse
Width
- Modulator
+
+
- Pulse
Width
+ Modulator
-
Short
Protector
VSS
INR
COM
STBY
VDDR
OUTRP
VSSR
OUTRN
VDDR
VDDR
VDDL
OUTLP
VSSL
VDDL
OUTLN
VSSL
VDDR
OUTRP
VSSR
VDDR
OUTRN
VSSR
Soft Start
Control Logic
Low Voltage
Detector
MUTE STBY TEST
Ver.2003-03-12
-1-
No Preview Available ! |
NJU8755
! PIN DESCRIPTION
No.
SYMBOL
I/O
FUNCTION
1 VDD − Power Supply : VDD=5.0V
2 INL I L-channel signal input
3
TEST
I
Maker test
This pin must be connected to GND.
4
MUTE
I
Mute control
Low : Mute ON High : Mute OFF
5
9
VDDL
− L-channel Power Supply : VDDL=5.0V
10
6
OUTLP
O L-channel positive output
7
VSSL
− L-channel Power GND
8
OUTLN
O L-channel negative output
11
12
VDDR
− R-channel Power Supply : VDDR=5.0V
16
13
OUTRN
O R-channel negative output
14
VSSR
− R-channel Power GND : VSSR=0V
15
OUTRP
O R-channel positive output
17
STBY
I
Standby control
Low : Standby ON High : Standby OFF
18
COM
− Analog common
19 INR I R-channel signal input
20 VSS − Power GND : VSS=0V
*The relations of ”VSS= VSSL= VSSR=0V” and “VDD= VDDL=VDDR” must be maintained.
*Pin No.4(MUTE) and 17(STBY) must be connected to VDD, when these pins are not used.
-2-
Ver.2003-03-12
No Preview Available ! |
NJU385755
! FUNCTIONAL DESCRIPTION
(1) Signal Output
The OUTLP/LN and OUTRP/RN generate respectively L-channel and R-channel PWM output signals, which will
be converted to analog signal via external 2nd-order or higher LC filter. A switching regulator with a high
response against a voltage fluctuation is the best selection for the VDDL and VDDR, which are the power supply for
output drivers. To obtain better THD performance, the stabilization of the power is required.
(2) Standby
By setting the STBY pin to “L”, the standby mode is enabled. In the standby mode, the entire functions of the
NJU8755 enter a low-power state, and the output pins(OUTLP/LN and OUTRP/RN) are high impedance.
(3) Mute
By setting the MUTE pin to “L”, the Mute function is enabled. In the Mute mode, the output pins(OUTLP/LN and
OUTRP/RN) output square wave(Duty: 50%).
(4) Low Voltage Detector
When the power supply voltage drops down to below VDD(MIN), the internal oscillation is halted for prevention
to generate unwanted frequency, and the output pins(OUTLP/LN and OUTRP/RN) become in high impedance.
(5) Short Circuit Protection
The short protector, which protects the NJU8755 against high short-circuit current, turns off the output drivers
of L-channel and R-channel independently. After about 5 seconds from the protection, the NJU8755 returns to
normal operation. The short protector functions at following accidents.
• Short between OUTLP and OUTLN
• Short between OUTLP and VSSL
• Short between OUTLN and VSSL
• Short between OUTRP and OUTRN
• Short between OUTRP and VSSR
• Short between OUTRN and VSSR
Note 1) The detectable current and the period for the protection depend on the power supply voltage and
ambient temperature.
Note 2) The short protector is not effective for a long term short-circuit but for an instantaneous accident.
Continuous high-current may cause permanent damage to NJU8755.
Ver.2003-03-12
-3-
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