PAM PAM8603M

PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Features
General Description
n 3W Output at 10% THD with a 4 Ω Load and
5V Power Supply
n Filterless, Low Quiescent Current and Low
EMI
n Low THD+N
n 64-Step DC Volume Control from -75dB to
+24dB
n Superior Low Noise
n Efficiency up to 89%
n Short Circuit Protection
n Thermal Shutdown
n Few External Components to Save the
Space and Cost
n Pb-Free Package
The PAM8603M is a 3W, sterero, class-D audio
amplifier with DC volume control. It offers low
THD+N, allowing it to produce high-quality sound
reproduction. The new filterless architecture
allows the device to drive the speaker directly,
requiring no low-pass output filters , which saves
the system cost and PCB area.
With the same numbers of external components,
the efficiency of the PAM8603M is much better
than class-AB cousins. It can extend the battery
life thus ideal for portable applications.
The PAM8603M is available in SSOP-24 and
SOP-18 packages.
Applications
n
n
n
n
n
LCD Monitors/TV Projectors
Notebook Computers
Portable Speakers
Portable DVD Players, Game Machines
Cellular Phones/Speaker Phones
Typical Application Circuit
Efficiency vs Output Power
PVDDL
100
10μF
90
80
PVDDL
Efficiency(%)
1μF
PGNDL
+OUTL
+OUTR
-OUTL
-OUTR
70
RL=4Ω
60
RL=8Ω
50
40
30
20
0
0.47 μF
0.47μF
INL
10
INL
INR
PAM8603M
INR
VREF
0.5
1
1.5
2
2.5
3
Output Pow er(W)
VDD
1μF
0
VDD
1μF
Radiated Emissions
ON
SHDN
VDC
MUTE
VOLUME
SHDN
ON
50kO
FCC Class B Limit
MUTE
PVDDR PGNDR
GND
1μF
10μF
PVDDR
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PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Block Diagram
PVDDR PGNDR
VDD
VDD/2
+
INR
+
-
+OUTR
DRIVER
-OUTR
MODULATOR
THERMAL
PROTECTION
MUTE
SHDN
Attenuation Decoder
Interface Control
VDC
VOLUME
INTERNAL
OSCILLATOR
BIAS AND
REFERENCES
VREF
OSC
CURRENT
PROTECTION
MODULATOR
INL
+
-
+OUTL
DRIVER
-OUTL
+
VDD/2
GND
PVDDL
PGNDL
Pin Configuration & Marking Information
Top View
SSOP-24
2
3
4
5
MUTE 6
VDD 7
INL 8
NC 9
VDC10
VOLUME 11
NC12
+OUTL
PGNDL
-OUTL
PVDDL
MUTE
VDD
INL
VDC
VOLUME
22 PGNDR
21 -OUTR
20 PVDDR
19 SHDN
18 GND
17 INR
16 NC
1
2
3
4
5
6
7
8
9
PAM8603M
XXXYWWXX
24 +OUTR
23 PGNDR
1
PAM8603M
XXXYWWXX
+OUTL
PGNDL
PGNDL
-OUTL
PVDDL
Top View
SOP-18
18
17
16
15
14
13
12
11
10
+OUTR
PGNDR
-OUTR
PVDDR
SHDN
GND
INR
NC
VREF
15 NC
14 VREF
13 NC
X: Internal Code
Y: Year
WW: Week
Power Analog Microelectronics , Inc
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10/2008 Rev 1.0
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PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Pin Descriptions
Pin Name
SSOP-24
SOP-18
Description
+OUTL
1
1
Left Channel Positive Output
PGNDL
2,3
2
Left Channel Power GND
-OUTL
4
3
Left Channel Negative Output
PVDDL
5
4
Left Channel Power Supply
MUTE
6
5
Mute Control Input(active low)
VDD
7
6
Analog Power Supply
INL
8
7
Left Channel Input
NC
9, 12,13,15,16
11
No Connect
VDC
10
8
Analog reference for gain control section
VOLUME
11
9
DC volume control to set the gain of Class-D
VREF
14
10
Internal analog reference, connect a bypass capacitor from
VREF to GND
INR
17
12
Right Channel Input
GND
18
13
Analog Ground
SHDN
19
14
Shutdown Control Input(active low)
PVDDR
20
15
Right Channel Power Supply
-OUTR
21
16
Right Channel Negative Output
PGNDR
22,23
17
Right Channel Power GND
+OUTR
24
18
Right Channel Positive Output
Absolute Maximum Ratings
These are stress ratings only and functional operation is not implied . Exposure to absolute
maximum ratings for prolonged time periods may affect device reliability . All voltages are with
respect to ground .
Supply Voltage ............................................6.6V
Input Voltage.............................-0.3V to V DD+0.3V
Maximum Junction Temperature..................150 °C
Storage Temperature.....................-65°C to 150 °C
Soldering Temperature...................... 300°C, 5sec
Recommended Operating Conditions
Supply Voltage Range....................... 2.8V to 5.5V
Max. Supply Voltage (for Max. duration of
30 minutes)................................................6.4V
Junction Temperature Range.........-40 °C to 125 °C
Ambient Temperature Range............-40 °C to 85 °C
Thermal Information
Parameter
Symbol
Thermal Resistance (Junction to Ambient)
θJA
Thermal Resistance (Junction to Case)
θJc
Package
Maximum
Unit
SSOP-24
96
°C/W
SOP-18
70
°C/W
SSOP-24
18
°C/W
SOP-18
16
°C/W
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PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Electrical Characteristic
V DD=5V, Gain=20dB,T A=25 °C, unless otherwise noted.
Symbol
VDD
Parameter
Test Conditions
Supply Voltage
THD+N=1%, f=1kHz, RL=4Ω
Output Power
THD+N=10%, f=1kHz,RL=8Ω
THD+N=1%,f=1kHz,R L=8Ω
VDD =5.0V,Po=0.5W,RL=8Ω
THD+N
Total Harmonic
VDD =3.6V,Po=0.5W,RL=8Ω
Distortion Plus Noise
VDD =5.0V,Po=1W,R L=4Ω
Cs
SNR
Vn
Dyn
η
Power Supply Ripple
Rejection
VDD =5.0V, Inputs ac-grounded
2.85
3.2
V DD =3.6V
1.55
1.8
V DD =5.0V
2.35
2.6
V DD =3.6V
1.25
1.5
V DD =5.0V
1.55
1.8
V DD =3.6V
0.75
0.9
V DD =5.0V
1.15
1.4
V DD =3.6V
0.5
0.72
0.15
0.3
0.11
0.25
f=100Hz
-59
-50
f=1kHz
-58
-50
-95
-80
VDD =5V, Vo_rms=1V, f=1kHz
85
IMUTE
IS D
Rdson
98
A-weighting
75
150
with Cin=0.47μF
No A-weighting
120
300
VDD =5.0V, THD=1%, f=1kHz
RL=8Ω, THD=10%
f=1kHz
102
85
89
80
85
dB
μV
dB
%
VDD =3.6V
8.5
15
Muting Current
VDD =5.0V, V MUTE=0.3V
2.7
5
mA
Shutdown Current
VDD =2.5V to 5.5V, VS D=0.3V
1
μA
Static Drain-to-source
On-state Resistor
IDS =500mA,Vgs=5V
240
500
NMOS
180
350
260
300
kHz
10
50
mV
VDD =3V to 5V
Vos
Output Offset Voltage
Vin=0V, V DD =5V
VIH
SD/MUTE Input High
VDD =5V
1.45
V IL
SD/MUTE Input Low
VDD =5V
0.65
200
Over Temperature
Protection
No Load, Junction Temperature, VDD=5V
Over Temperature Hysterisis
mA
PMOS
Switching Frequency
OTH
dB
20
No load
fsw
OTP
%
13.5
Quiescent Current
VDD =5V
90
%
dB
VDD =5V, Inputs ac-grounded
RL=4Ω, THD=10%
IQ
W
0.25
Signal-to-noise ratio
Efficiency
W
0.11
VDD =5V,Po=0.5W, R L=8Ω,f=1kHz
Dynamic range
W
0.3
f=1kHz
V
W
0.15
f=1kHz
Crosstalk
Output noise
MAX UNIT
5.5
V DD =5.0V
VDD =3.6V,Po=1W,R L=4Ω
PSRR
TYP
2.8
THD+N=10%, f=1kHz,RL=4Ω
Po
MIN
135
mΩ
V
°C
30
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PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Typical Operating Characteristics (T =25°C)
A
1. Efficiency VS Output Power
100
100
90
90
80
80
V DD=5V
60
50
V DD=3.6V
40
70
Efficiency (%)
Efficiency (%)
70
30
2. Efficiency VS Output Power
V DD=5V
60
50
V DD=3.6V
40
30
20
20
10
10
R L=8 Ω
0
0
0.5
1
1.5
R L=4 Ω
0
2
0
0.5
1
R L=4 Ω
Gain=20dB
f=1kHz
10
5
V DD=5V
V DD=5V
2
V DD=3.6V
1
1
V DD=3.6V
% 0.5
%
0.5
0.2
0.2
0.1
0.1
0.05
.
0 05
0.02
0.02
0.01
10m
0.01
20m
50m
100 m
200 m
500 m
1
2
10 m
4
20 m
50 m
100m
5. THD+N VS Frequency
500m
1
2
4
6. THD+N VS Frequency
10
10
Po=0.5W
R L=8 Ω
Cin=0.47 μ F
Gain=20dB
5
2
2
%
200m
W
W
5
3
30
20
R L=8 Ω
Gain=20dB
f=1kHz
2
2.5
4.THD+N VS Output Power
3.THD+N VS Output Power
30
5
2
Output Pow er (W)
Output Pow er (W)
10
1.5
1
%
1
0.5
V DD=5V
0.5
Po=1W
R L=4 Ω
Cin=0.47 μ F
Gain=20dB
V DD=3.6V
0.2
0.2
V DD=5V
V DD=3.6V
0.1
20
50
100
200
500
1k
2k
5k
0.1
10k
0.08
20
20k
50
100
200
500
1k
2k
5k
10k
20k
Hz
Hz
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PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Typical Operating Characteristics (T =25°C)
A
7. Frequency Response
8.PSRR VS Frequency
+5
+0
[email protected]
Cin=0.47 μ F, R L=8 Ω
V DD=3.6V/5V
+4
+3
-20
+2
-30
+1
d
B
r
-40
d
B
+0
A
Inputs ac-ground
V DD=5V,100mVpp,
Cin=0.47 μ F,R L=8 Ω
-10
-50
-1
-60
-2
-70
-3
-80
-4
-90
-5
20
50
100
200
500
1k
2k
5k
10k
-100
20
20k 30k
50
100
200
500
9. Crosstalk VS Frequency
-50
T T T T T T
-55
+0
T T T
-65
-30
-40
-50
-75
R to L
-70
-80
-90
A
-95
-90
-100
-100
-110
-105
-120
-110
-130
L to R
-115
-120
20
50
100
200
500
1k
-140
2k
5k
10k
-150
20
20k
50
100
200
11. Quiescent Current VS Supply Voltage
0.3
No input
RL=No Load
Shutdown Current(uA)
Quiescent Current(mA)
500
1k
2k
5k
10k
20k
Hz
Hz
18
16
14
12
10
8
6
4
2
0
10k
-60
d
B
r
-80
-85
5k
Inputs ac-ground,
V DD=5.0V
Cin=0.47 μ F,
R L=8 Ω
-20
-70
d
B
2k
10. Noise Floor FFT
-10
Gv=20dB ,R L=4
V DD=5.0V,
Po=0.5W
-60
1k
Hz
Hz
0.25
12. Shutdown Current VS Supply Voltage
No input
No Load
0.2
0.15
0.1
0.05
0
2.5
3
3.5
4
4.5
5
2.5
5.5
3
3.5
4
4.5
5
5.5
Power Supply Voltage(V)
Power Supply Voltage(V)
Power Analog Microelectronics , Inc
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PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Typical Operating Characteristics (T =25°C)
A
13. Output Power VS Supply Voltage
Output Power(W)
R L=8 Ω
R L=4 Ω
3.5
THD=10%
2
14. Output Power VS Supply Voltage
4
Output Power(W)
2.5
1.5
1
THD=1%
0.5
THD=10%
3
2.5
2
1.5
THD=1%
1
0.5
0
0
2.5
255
250
5.5
2.5
3
15. Rdson VS Output Current
PMOSFET
Vgs=-5V
240
235
230
225
220
4.5
5
5.5
NMOSFET
Vgs=5V
170
168
166
164
162
160
158
156
154
215
50
100
200 300
400
50
500 750 1000 1500
100
200 300
400
500 750 1000 1500
Drain-source Current(mA)
Drain-source Current(mA)
18. Gain Control VS Volume Voltage
17. Frequency VS Supply Voltage
40
Input AC-ground
V DD=5V
20
0
Gain(dB)
Frequency(KHz)
4
16. Rdson VS Output Current
172
245
300
290
280
270
260
250
240
230
220
210
200
3.5
Power Supply Voltage(V)
Drain-source Resistance(Ω)
Drain-source Resistance(Ω)
260
3
3.5
4
4.5
5
Power Supply Voltage(V)
-20
-40
-60
-80
3
3.5
4
4.5
5
0.1 0.2 0.4 0.5 0.7 0.8 0.9 1.1 1.2 1.4 1.5 1.6 1.8 1.9 2.1 2.2 2.3 2.5 2.6 2.8 2.9 3.0 3.2 3.3 3.5 3.6 3.7 3.9 4.0 4.2 4.3 4.4
5.5
Volume Voltage(V)
Power Supply Voltage(V)
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PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Table 1. DC Volume Control
STEP
Gain (dB)
STEP
Gain (dB)
0
-75
32
11.6
1
-40
33
12
2
-34
34
12.4
3
-28
35
12.8
4
-22
36
13.2
5
-16
37
13.6
6
-10
38
14
7
-7.5
39
14.4
8
-5
40
14.8
9
-2.5
41
15.2
10
0
42
15.6
11
1.5
43
16
12
3
44
16.4
13
4
45
16.8
14
4.4
46
17.2
15
4.8
47
17.6
16
5.2
48
18
17
5.6
49
18.4
18
6
50
18.8
19
6.4
51
19.2
20
6.8
52
19.6
21
7.2
53
20
22
7.6
54
20.4
23
8
55
20.8
24
8.4
56
21.2
25
8.8
57
21.6
26
9.2
58
22
27
9.6
59
22.4
28
10
60
22.8
29
10.4
61
23.2
30
10.8
62
23.6
31
11.2
63
24
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PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
3. The input signal should not be too high. If too
high, it will cause the clipping of output signal
when increasing the volume. Because the DC
volume control of the PAM8603M has big gain, it
will make the device damaged.
Application Notice
1. When the PAM8603M works with LC filters, it
should be connected with the speaker before it is
powered on, otherwise it will be damaged easily.
4. When testing the PAM8603M without LC
filters by using resistor instead of speaker as the
output load, the test results, e.g. efficiency, will
be worse than those using speaker as load.
2. When the PAM8603M works without LC
filters, it's better to add a ferrite chip bead at the
outgoing line of speaker to suppress the possible
electromagnetic interference.
Test Setup for Performance Testing
PAM8603M Demo Board
Load
+OUT
AP System
AP
LPF
Input
Generator
AUX-0025
GND
AP System
Analyzer
- OUT
V DD
Power Supply
Notes
1. The AP AUX-0025 low pass filter is necessary for class-D amplifier measurement done by AP analyzer.
2. Two 22 μ H inductors are used in series with load resistor to emulate the small speaker for efficiency
measurement.
Power Analog Microelectronics , Inc
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PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Application Information
case, input capacitor (C i) and input resistance (R i)
of the amplifier form a high-pass filter with the
corner frequency determined equation below,
Mute Operation
The MUTE pin is an input for controlling the
output state of the PAM8603M. A logic low on this
pin disables the outputs, and a logic high enables
the outputs. This pin may be used as a quick
disable or enable of the outputs without a volume
fade. Quiescent current is listed in the electrical
characteristic table. The MUTE pin can be left
floating due to the internal pull-up .
1
2πRiCi
In addition to system cost and size, click and pop
perfor mance is affected by the size of the input
coupling capacitor, C i. A larger input coupling
capacitor requires more charge to reach its
quiescent DC voltage (nominally 1/2 V DD). This
charge comes from the internal circuit via the
feedback and is apt to create pops upon device
enable. Thus, by minimizing the capacitor size
based on necessary low frequency response,
turn-on pops can be minimized.
fC=
For better power-off pop performance, the
amplifier should be placed in the mute mode prior
to removing the power supply.
Shutdown Operation
In order to reduce power consumption while not in
use, the PAM8603M contains shutdown circuitry
to turn off the amplifier's bias circuitry. The
amplifier is turned off when logic low is placed on
the SHDN pin. By switching the SHDN pin
connected to GND, the PAM8603M supply current
draw will be minimized in idle mode. The SHDN
pin can be left floating due to the internal pull-up.
Analog Reference Bypass Capacitor (C BYP)
The Analog Reference Bypass Capacitor (C BYP) is
the most critical capacitor and serves several
important functions. During start-up or recovery
from shutdown mode, C BYP determines the rate at
which the amplifier starts up. The second function
is to reduce noise produced by the power supply
coupling in the output drive signal. This noise is
from the internal analog reference to the amplifier
which appears as degraded PSRR and THD+N.
Power Supply Decoupling
The PAM8603M is a high performance CMOS
audio amplifier that requires adequate power
supply decoupling to ensure the output THD and
PSRR as low as possible. Power supply
decoupling affects low frequency response.
Optimum decoupling is achieved by using two
capacitors of different types that target different
noise on the power supply leads. For higher
frequency transients, spikes, or digital hash on
the line, a good low equivalent-series resistance
(ESR) ceramic capacitor, typically 1.0 μ F, placed
as close as possible to the device VDD terminal
works best. For filtering lower-frequency noise
signals, a large capacitor of 10μF (ceramic) or
greater placed near the audio power amplifier is
recommended.
A ceramic bypass capacitor (C BYP) of 0.47μF to
1.0μF is recommended for the best THD and noise
performance. Increasing the bypass capacitor
reduces clicking and popping noise from power
on/off and entering and leaving shutdown.
Under Voltage Lock-out (UVLO)
The PAM8603M incorporates circuitry to detect
low supply voltage. When the supply voltage
drops to 1.8V or below, the PAM8603M outputs
are disable. The device resumes to normal
functional once V DD ≥2.0V.
Short Circuit Protection (SCP)
The PAM8603M has short circuit protection
circuitry on the outputs to prevent the device from
damage when output-to-output or output-to-GND
short. When a short circuit is detected on the
outputs, the outputs are disable immediately. If
the short was removed, the device activates
again.
Input Capacitor (C i)
Large input capacitors are both expensive and
space hungry for portable designs. Clearly, a
certain sized capacitor is needed to couple in low
frequencies without severe attenu ation. But in
many cases the speakers used in portable
systems, whether internal or external, have little
ability to reproduce signals below 100Hz to
150Hz. Thus, using a large input capacitor may
not increase actual system perfor mance. In this
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PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
PCB Layout Guidelines Grounding
At this stage it is paramount to notice the
necessity of separate grounds. Noise currents in
the output power stage need to be returned to
output noise ground and nowhere else. Were
these currents to circulate elsewhere, they may
get into the power supply, the signal ground, etc,
even worse, they may form a loop and radiate
noise. Any of these cases results in degraded
amplifier performance. The logical returns for the
output noise currents associated with Class-D
switching are the respective PGND pins for each
channel. The switch state diagram illustrates that
PGND is instrumental in nearly every switch
state. This is the perfect point to which the output
noise ground trace should return. Also note that
output noise ground is channel specific. A twochannel amplifier has two seperate channels and
consequently must have two seperate output
noise ground traces. The layout of the PAM8603M
offers separate PGND connections for each
channel and in some cases each side of the
bridge. Output noise grounds must be tied to
system ground at the power exclusively. Signal
currents for the inputs, reference, etc need to be
returned to quite ground. This ground is only tied
to the signal components and the GND pin, and
GND then tied to system ground.
Over Temperature Protection
Thermal protection on the PAM8603M prevents
the device from damage when the internal die
temperature exceeds 135°C. There is a 15 degree
tolerance on this trip point from device to device.
Once the die temperature exceeds the thermal set
point, the device outputs are disabled. This is not
a latched fault. The thermal fault is cleared once
the temperature of the die is reduced by 30 °C .
This large hysteresis will prevent motor boating
sound well. The device begins normal operation
at this point without external system interaction.
How to Reduce EMI (Electro Magnetic
Interference)
A simple solution is to put an additional capacitor
1000 μ F at power supply terminal for power line
coupling if the traces from amplifier to speakers
are short (<20cm).
Most applications require a ferrite bead filter as
shown at Figure 3. The ferrite filter reduces EMI of
around 1 MHz and higher. When selecting a ferrite
bead, choose one with high impedance at high
frequencies, and low impedance at low
frequencies (MH2012HM221-T).
Ferrite Bead
OUT+
200pF
Ferrite Bead
OUT200pF
Figure 3: Ferrite Bead Filter to Reduce EMI
Power Analog Microelectronics , Inc
www.poweranalog.com
10/2008 Rev 1.0
11
PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Ordering Information
PAM8603M X X X
Shipping Package (R: Tape & Reel, T: Tube)
Number of Pins (H: 24, E: 18)
Package Type (N: SSOP, D: SOP)
Part Number
PAM8603MNHR
PAM8603MDER
PAM8603MDET
Marking
PAM8603M
XXXYWWLL
PAM8603M
XXXYWWLL
PAM8603M
XXXYWWLL
Package Type
MOQ/Shipping Package
SSOP-24
2,500 Units/Tape & Reel
SOP-18
1,000 Units/Tape & Reel
SOP-18
40 Units/Tube
Power Analog Microelectronics , Inc
www.poweranalog.com
10/2008 Rev 1.0
12
PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Outline Dimension
SSOP-24
Power Analog Microelectronics , Inc
www.poweranalog.com
10/2008 Rev 1.0
13
PAM8603M
3W Filterless Stereo Class-D Audio Amplifier with DC Volume Control
Outline Dimension
SOP-18
D
A3
0.25
A2 A
c
θ
A1
L
L1
b
b1
E1 E
c1 C
BASE METAL
WITH PLATING
SECTION B-B
b
B
e
SYMBOL
B
MILLIMETER
MIN
NOM
MAX
A
-
-
2.70
A1
0.08
0.18
0.30
A2
2.10
2.30
2.50
A3
0.92
1.02
1.12
b
0.35
-
0.44
b1
0.34
0.37
0.39
c
0.26
-
0.31
c1
0.24
0.25
0.26
D
11.25
11.45
11.76
E
10.00
10.30
10.64
E1
7.30
7.50
7.70
e
L
1.27BSC
0.70
L1
θ
0.85
1.00
1.40BSC
0°
-
8°
Power Analog Microelectronics , Inc
www.poweranalog.com
10/2008 Rev 1.0
14