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參數(shù)資料
| 型號： | NCP1215SNT1 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Low Cost Variable OFF Time Switched Mode Power Supply Controller |
| 中文描述： | SWITCHING CONTROLLER, PDSO6 |
| 封裝： | SOT-23, SC-59, TSOP-6 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 148K |
| 代理商： | NCP1215SNT1 |
NCP1215
http://onsemi.com
11
The EF16 core for transformer was selected. It has
crosssection area A
e
= 20.1 mm
2
. The N67 magnetic
allows to use maximum operating flux density
B
max
= 0.28 Tesla.
The number of turns of the primary winding is:
Lp· Ippk
Bmax· Ae
4.14 · 103· 0.2047
0.28 · 20.1 · 106
The A
L
factor of the transformer’s core can be calculated:
Lp
(np)2
For an adapter output voltage of 6.5 V, the number of turns
of the secondary winding can be calculated accounting
Schottky diode for output rectifier as follows:
(Vs
Vfwd)(1
max· Vbulkmin
(eq. 20)
np
150 turns
(eq. 21)
AL
4.14 · 103·
(150)2
184 nH
(eq. 22)
ns
max)np
(6.5
0.7)(1
0.5 · 127
0.5)150
8.5
9 turns
The number of turns for auxiliary winding can be
calculated similarly:
(eq. 23)
ns
(Vs
Vfwd)(1
max· Vbulkmin
max)np
(12
1)(1
0.5 · 127
0.5)150
15.35
15 turns
The peak primary current is known from initial
calculations. The current sense method allows choosing the
voltage drop across the current sense resistor. Let’s use a
value of 0.5 V. The value of the current sense resistor can
then be evaluated as follows:
(eq. 24)
RCS
VCS
Ippk
0.5
0.2047
2.442
2.7
The voltage drop across the sense resistor needs to be
recalculated:
VCS
RCS· Ippk
2.7 · 0.2047
Using the above results the value of the shift resistor is:
(eq. 25)
0.553 V
(eq. 26)
Rshift
VCS
ICS
0.553
50 · 106
11.06 k
11 k
The value of timing capacitor for the off time control has
to be calculated for minimum bulk capacitor voltage since
at these conditions the converter should be able to deliver
specified maximum output power. The value of the timing
capacitor is then given by the following equation:
(eq. 27)
CT
1
fsw
Lp · Ippk
Vbulkmin
1.2 · 106
1
75 · 103
4.14 · 10
3· 0.2047
127
0.12 · 106
55.5 pF
56 pF
The value of the startup resistor for startup time of 200 ms
and Vcc capacitor of 200 nF is following:
Vbulkmin
CVcc
tstartup
(eq. 28)
Rstartup
Vstartup
ICCstartMAX
127
200 · 109
12
0.2
10 · 106
5.77 M
5.6 M
The result of all the calculations is the application
schematic depicted in Figure 21.
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