MBR1100(2003) 데이터 시트보기 (PDF) - ON Semiconductor
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MBR1100 Datasheet PDF : 4 Pages
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MBR1100
150
100
90
80
70
60
TJ = 25°C
50
fTEST = 1 MHz
40
30
20
15
0 10 20 30 40 50 60 70 80 90 100
VR, REVERSE VOLTAGE (VOLTS)
Figure 5. Typical Capacitance
NOTE 1 — MOUNTING DATA:
Data shown for thermal resistance junction-to-ambient
(RqJA) for the mounting shown is to be used as a typical
guideline values for preliminary engineering or in case the
tie point temperature cannot be measured.
Typical Values for RqJA in Still Air
Mounting
Method
Lead Length, L (in)
1/8 1/4 1/2 3/4
1
52
65
72
85
2
67
80
87 100
3
—
50
RqJA
°C/W
°C/W
°C/W
Mounting Method 1
P.C. Board with
1-1/2 ″ x 1-1/2″
copper surface.
ÉÉÉÉÉÉLÉÉÉÉÉÉL ÉÉÉÉ
Mounting Method 2
ÉÉÉÉÉÉLÉÉÉÉÉÉLÉÉÉÉ
VECTOR PIN MOUNTING
Mounting Method 3
P.C. Board with
1-1/2 ″ x 1-1/2″
copper surface.
L = 3/8″
ÉÉÉÉ BOARD GROUND
PLANE
NOTE 2 — THERMAL CIRCUIT MODEL:
(For heat conduction through the leads)
RqS(A)
RqL(A)
RqJ(A)
TA(A)
TL(A)
TC(A)
TJ
RqJ(K)
RqL(K)
RqS(K)
PD
TC(K)
TA(K)
TL(K)
Use of the above model permits junction to lead thermal
resistance for any mounting configuration to be found. For
a given total lead length, lowest values occur when one side
of the rectifier is brought as close as possible to the heat sink.
Terms in the model signify:
TA = Ambient Temperature TC = Case Temperature
TL = Lead Temperature
TJ = Junction Temperature
RqS = Thermal Resistance, Heat Sink to Ambient
RqL = Thermal Resistance, Lead to Heat Sink
RqJ = Thermal Resistance, Junction to Case
PD = Power Dissipation
(Subscripts A and K refer to anode and cathode sides,
respectively.) Values for thermal resistance components are:
RqL = 100°C/W/in typically and 120°C/W/in maximum.
RθJ = 36°C/W typically and 46°C/W maximum.
NOTE 3 — HIGH FREQUENCY OPERATION:
Since current flow in a Schottky rectifier is the result of
majority carrier conduction, it is not subject to junction
diode forward and reverse recovery transients due to
minority carrier injection and stored charge. Satisfactory
circuit analysis work may be performed by using a model
consisting of an ideal diode in parallel with a variable
capacitance. (See Figure 5)
Rectification efficiency measurements show that
operation will be satisfactory up to several megahertz. For
example, relative waveform rectification efficiency is
approximately 70 percent at 2 MHz, e.g., the ratio of dc
power to RMS power in the load is 0.28 at this frequency,
whereas perfect rectification would yield 0.406 for sine
wave inputs. However, in contrast to ordinary junction
diodes, the loss in waveform efficiency is not indicative of
power loss: it is simply a result of reverse current flow
through the diode capacitance, which lowers the dc output
voltage.
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