參數(shù)資料
型號(hào)： LT3512MPMS#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： 0.8 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO12
封裝： LEAD FREE, PLASTIC, MSOP-16/12
文件頁(yè)數(shù)： 5/26頁(yè)
文件大小： 244K
代理商： LT3512MPMS#PBF
LT3512
13
3512fa
APPLICATIONS INFORMATION
current is highest at this point along with the energy stored
in the leakage inductance. A 0.5W Zener will satisfy most
applications when the highest VZENER is chosen. Choosing
a low value for VZENER will cause excessive power loss as
shown in the following equations:
DZ Power Loss
=
1
2
L I
PK(VIN(MIN))
2 f
SW
1
+
N
PS VOUT + VF
()
V
ZENER –NPS VOUT + VF
()
L = Leakage Inductance
I
PK(VIN(MIN)) =
V
OUT IOUT 2
ηV
IN(MIN) DVIN(MIN)
f
SW =
1
t
ON + tOFF
=
1
L
PRI IPK(VIN(MIN))
V
IN(MIN)
+
L
PRI IPK(VIN(MIN))
N
PS VOUT + VF
()
Table 2 and 3 show some recommended diodes and Zener
diodes.
Table 2. Recommended Zener Diodes
PART
VZENER
(V)
POWER
(W)
CASE
VENDOR
MMSZ5266BT1G
68
0.5
SOD-123
On Semi
MMSZ5270BT1G
91
0.5
SOD-123
CMHZ5266B
68
0.5
SOD-123
Central
Semiconductor
CMHZ5267B
75
0.5
SOD-123
BZX84J-68
68
0.5
SOD323F NXP
BZX100A
100
0.5
SOD323F
Table 3. Recommended Diodes
PART
I (A)
VREVERSE
(V)
VENDOR
DFLS1200
1.0
200
Diodes Inc.
DFLS1150
1.0
150
Leakage Inductance Blanking
When the power switch turns off, the flyback pulse ap-
pears. However, a finite time passes before the trans-
former primary-side voltage waveform approximately
represents the output voltage. Rise time on the SW node
and transformer leakage inductance cause the delay. The
leakage inductance also causes a very fast voltage spike
on the primary side of the transformer. The amplitude of
the leakage spike is largest when power switch current is
highest. Introduction of an internal fixed delay between
switch turn-off and the start of sampling provides im-
munity to the phenomena discussed above. The LT3512
sets internal blanking to 150ns. In certain cases leakage
inductance spikes last longer than the internal blanking,
but will not significantly affect output regulation.
Secondary Leakage Inductance
In addition to primary leakage inductance, secondary leak-
age inductance exhibits an important effect on application
design. Secondary leakage inductance forms an inductive
divider on the transformer secondary. The inductive divider
effectively reduces the size of the primary-referred flyback
pulse. The smaller flyback pulse results in a higher regulated
output voltage. The inductive divider effect of secondary
leakage inductance is load independent. RFB/RREF ratio
adjustments can accommodate this effect to the extent
secondary leakage inductance is a constant percentage
of mutual inductance (over manufacturing variations).
Winding Resistance Effects
Resistance in either the primary or secondary will reduce
overall efficiency (POUT/PIN). Good output voltage regula-
tion will be maintained independent of winding resistance
due to the boundary mode operation of the LT3512.
Bifilar Winding
A bifilar, or similar winding technique, is a good way to
minimize troublesome leakage inductances. However, re-
member that this will also increase primary-to-secondary
capacitance and limit the primary-to-secondary breakdown
voltage, so bifilar winding is not always practical. The
Linear Technology applications group is available and
extremely qualified to assist in the selection and/or design
of the transformer.
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