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参数资料
| 型号： | SP6652LEDEB |
| 厂商： | Exar Corporation |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP6652LED |
| 标准包装： | 1 |
| 系列： | * |
APPLICATIONS INFORMATION
Manufacturers/ Website
TDK/www.tdk.com
TDK/www.tdk.com
TDK/www.tdk.com
Murata/www.murata.com
Murata/www.murata.com
Murata/www.murata.com
Part Number
C1005X5R0J105M
C1608X5R0J475K
C2012X5R0J106M
GRM155R60J105KE19B
GRM188R60J475KE19
GRM21BR60J106KE19L
Capacitance/
Voltage
1uF/6.3V
4.7uF/6.3V
10uF/6.3V
1uF/6.3V
4.7uF/6.3V
10uF/6.3V
Capacitor
Size/Type/Thickness
0402/X5R/0.5mm
0603/X5R/0.9mm
0805/X5R/1.35mm
0402/X5R/0.55mm
0603/X5R/0.9mm
0805/X5R/1.35mm
ESR at
100KHz
0.03
0.02
0.02
0.03
0.02
0.02
Table 1. Capacitor Selection
Note: Component highlighted in bold is used on the SP6652EB Evaluation Board.
The range of typical inductor values and sizes are shown here in Table 2.
Manufacturers/ Website
Coilcraft/ www.coilcraft
Coilcraft/ www.coilcraft
Sumida/ www.sumida.com
Sumida/ www.sumida.com
Wurth Elektronik/ www.we-online.de
Wurth Elektronik/ www.we-online.de
Part Number
MSS5131-332MX
MSS5131-332MX
CDRH3D28-3R3
CDRH3D28-4R7
WE-TPC #744042003
WE-TPC #744042004
Inductance/ Isat
Rating
3.3uH/1.6A
4.7uH/1.4A
3.3uH/2.0A
4.7uH/1.65A
3.3uH/1.8A
4.7uH/1.65A
Inductor
Length/Width/Thickness
5.1x5.1x3.1mm
5.1x5.1x3.1mm
4.0x4.0x3.0mm
4.0x4.0x3.0mm
4.8/4.8/1.8mm
4.8/4.8/1.8mm
DCR Max
ohms
0.032
0.045
0.058
0.071
0.065
0.082
Table 2. Inductor Selection
Note: Component highlighted in bold is used on the SP6652EB Evaluation Board.
The output voltage can be set using the
formula:
V OUT = V FB *( + R F /R I )
60
50
40
30
SP6652 Bode Plot .
At 0dB Loop Gain
Fo = 80kHz
Loop Phase = 50deg
180
150
120
90
Where V FB = 0.8V typically, and for no-load
T ON is kept within 200nsec Minimum:
T ON ( MIN ) = V OUT /(V IN *Freq).
20
10
0
-10
pole1 -3dB
at 4kHz
-20dB/dec
60
30
0
-30
-20
-60
-30
3.3Vout
-90
Compensation Component Selection
-40
-50
Rz = 4K ?
Cc = 10nF
-120
-150
For simplicity in compensation with ce -
ramic output capacitors, the SP6652 uses
current mode PWM control, so all that is
needed for stability is a series R Z and C C
at the COMP pin to compensate the error
amplifier. To see the actual SP6652 re -
sponse with frequency, in figure 3 we have
taken a bode plot of gain and frequency re -
sponse of the SP6652 circuit with 3.3Vout.
Looking first at the SP6652 Modulator Gain
at low frequency you see a constant gain
of about 26dB and the first pole or -3dB
point at about 4 kHz, where the slope of
the gain curve becomes about -20dB/de -
cade. At high frequency on the SP6652
Modulator Gain curve one can see the
modulator curve slope increase down -
-60 -180
100 1000 10000 100000 1000000
Log
SP6652 Loop Gain Frequency (Hz)
SP6652 Modulator Gain
SP6652 Loop Phase
SP6652 Modulator Phase
Figure 3. SP6652 Gain and Frequency
Response 3.3V output voltage
ward for a high frequency pole at about
150KHz, which is widely separated in
frequency from the low frequency 4kHz
pole, so that the SP6652 can be compen -
sated by a zero at the low frequency pole
where the gain slope is only -20dB/decade.
The gain for the error amplifier is the cross -
Oct10-07 RevJ
SP6652 1A, High Efficiency, Current Mode PWM Buck Regulator
9
? 2007 Sipex Corporation
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