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參數(shù)資料
| 型號： | AN-30 |
| 英文描述： | TOPSwitch-GX Forward Design Methodology |
| 中文描述： | 的TOPSwitch - GX系列正向設(shè)計方法 |
| 文件頁數(shù)： | 28/40頁 |
| 文件大?。?/td> | 311K |
| 代理商： | AN-30 |
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AN-30
28
B
12/02
As an initial estimate for a 3:1 operating range (V
MAX
: V
DROPOUT
),
D
MAX_GOAL
= 0.7
and for a 2:1 operating range,
D
MAX_GOAL
= 0.5
.
In EP-12 prototype the dropout voltage is low, to maximize holdup time, so a relatively high value for
D
MAX_GOAL
has been
selected. (Operating range is 373 V to 132 V or 2.8:1).
Set dropout voltage
V
= 132 V
Set the maximum duty-cycle
D
MAX_GOAL
= 0.7 V
(VDROPOUT, F24)
(DMAX_GOAL, F25)
Step (e). Determine the bulk capacitance:
C
The spreadsheet checks for the input capacitance value based on hold-up time and output power. The user should decide on a
hold-up time first and then try different values of input capacitance such that no warnings are shown. This indicates that with the
chosen capacitor value, it is possible to meet the desired hold-up time.
Assume 1
μ
F/W for doubled mains applications as a starting point. We thus have
C
= 1
μ
F/W
x
147.6 W = 147.6
μ
F
Select next larger standard value.
Note: The EP-12 design has a double input configuration. A doubler circuit has two capacitors in series, each of which have a
value which is twice that calculated above.
Selecting the next larger standard value for twice 147.6
μ
F, we have 2
x
C
IN
= 330
μ
F, 200 V
The actual value entered in the spreadsheet is
C
IN
= 165
μ
F
(CIN, B18)
Step (f). Selection of Rectifier diode drops (Vf):
V
,
V
,
V
,
V
The spreadsheet automatically selects the type of rectifier (ultra-fast or Schottky) based on the output voltage. The
corresponding diode drops are listed as follows:
The voltage drop on main winding rectifier diode
V
DMAIN
= 0.5 V
The voltage drop on mag-amp rectifier diode
V
DMAINMA
The voltage drop on auxiliary winding diode
V
The voltage drop on bias winding rectifier
V
DB
= 0.7 V
(VDMAIN, F41)
(VDMAINMA, F42)
(VDAUX1, F43)
(VDB, F45)
The values calculated by the spreadsheet may be overridden by entering the desired voltage drop in column B (B41 to B45).
Step (g). Selection of Bridge Rectifier Diode based on peak inverse voltage and average rectifier current
:
V
PIVAC
,
I
DAVBR
The recommended voltage rating for input bridge rectifier is given in Equation (29).
V
PIVAC
= 467 V
(VPIVAC, F49)
Current ratings for rectifiers have average values not RMS values. The current rating for the bridge rectifier can be calculated
from Equation (30) in AN-30.
I
DAVBR
= 0.714 A
(IDAVBR, F50)
Step (h). Selection of Ripple current factor:
K
K
is defined in AN-30. It is a ratio of the ripple in the output current to the average current in the output inductor. This determines
the size of the output inductor. As recommended in AN-30 choose
K
I
between 0.15 and 0.3.
For the EP12 design, this value was selected as
K
I
= 0.15
(KDI, B27)
Step (i). Selection of
TOPSwitch-GX
and related parameters:
I
P
,
K
I
,
RX,
VDS
The operating peak drain current is calculated as
I
P
=
2.45 A
(IP, F84)
Select an appropriate
TOPSwitch
according to peak primary current as well as for power dissipation.
The TOP247Y was selected and has a minimum current limit of 3.34 A. Current limit should be externally programmed to
approximately 8-12% above the operating peak drain current, that is
I
XLIMIT
= I
P
x
1.11 = 2.45
x
1.11 = 2.712 A.
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