MBR150 데이터 시트보기 (PDF) - Motorola => Freescale

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MBR150

Axial Lead Rectifiers

Motorola => Freescale 

90

80

BOTH LEADS TO HEAT SINK,

EQUAL LENGTH

70

60

MAXIMUM

50

TYPICAL

40

30

20

10

0 1/8 1/4 3/8 1/2 5/8 3/4 7/8 1.0

L, LEAD LENGTH (INCHES)

Figure 5. Steady–State Thermal Resistance

NOTE 3 — MOUNTING DATA:

Data shown for thermal resistance junction–to–ambient

(RθJA) 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 RθJA 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

RθJA

°C/W

°C/W

°C/W

NOTE 4 — THERMAL CIRCUIT MODEL:

(For heat conduction through the leads)

RθS(A) RθL(A) RθJ(A)

TA(A)

TL(A)

TC(A) TJ

RθJ(K) RθL(K) RθS(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

RθS = Thermal Resistance, Heat Sink to Ambient

RθL = Thermal Resistance, Lead to Heat Sink

RθJ = Thermal Resistance, Junction to Case

PD = Power Dissipation

MBR150 MBR160

200

TJ = 25°C

f = 1 MHz

100

80

70

60

50

40

30

20

0 10 20 30 40 50 60 70 80 90 100

VR, REVERSE VOLTAGE (VOLTS)

Figure 6. Typical Capacitance

Mounting Method 1

Mounting Method 3

P.C. Board with

P.C. Board with

1–1/2″ x 1–1/2″

1–1/2″ x 1–1/2″

copper surface.

L

L

ÉÉÉÉÉÉÉ

copper surface.

É L = 3/8″

ÉÉÉ BOARD GROUND

É PLANE

Mounting Method 2

ÉÉÉÉLÉÉÉÉÉÉLÉÉÉÉÉÉ

VECTOR PIN MOUNTING

(Subscripts A and K refer to anode and cathode sides,

respectively.) Values for thermal resistance components are:

RθL = 100°C/W/in typically and 120°C/W/in maximum.

RθJ = 36°C/W typically and 46°C/W maximum.

NOTE 5 — HIGH FREQUENCY OPERATION:

Since current flow in a Schottky rectifier is the result of ma-

jority carrier conduction, it is not subject to junction diode for-

ward 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 6.)

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 rectifica-

tion would yield 0.406 for sine wave inputs. However, in con-

trast to ordinary junction diodes, the loss in waveform effi-

ciency 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.

Rectifier Device Data

3

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