ST STPS745 User Manual

STPS745

Power Schottky rectifier

Main product characteristics

I

F(AV)

V

RRM

T

(max) 150° C

j

(max) 0.57 V

V

F

7.5 A

45 V

Features and Benefits

■ Very small conduction losses

■ Negligible switching losses

■ Extremely fast switching

■ Insulated package: TO-220FPAC

Insulating voltage = 2000 V DC Capacitance = 12 pF

■ Avalanche capability specified

Description

Single Schottky rectifier suited for Switch Mode Power Supply and high frequency DC to DC converters.

AK

K

A

NC

2

PAK

D

STPS745G

A

K

TO-220AC

STPS745D

’’‘

TO-220FPAC

STPS745FP

A

K

Packaged either in TO-220AC, TO-220FPAC or

2

D

PAK, this device is intended for use in low voltage, high frequency inverters, free wheeling and polarity protection applications.

March 2007 Rev 7 1/9

www.st.com

9

Characteristics STPS745

d

-

1 Characteristics

’

Table 1. Absolute Ratings (limiting values)

Symbo

l

V

RRM

I

F(RMS)

I

F(AV)

Repetitive peak reverse voltage 45 V

RMS forward voltage 20 A

Average forward current δ = 0.5

Parameter Value Unit

TO-220AC / D2PA K

= 160° C

T

c

7.5 A

TO-220FPAC Tc = 145° C

I

P

Surge non repetitive forward current tp = 10 ms Sinusoidal 150 A

FSM

Repetitive peak reverse current tp = 2 µs square F = 1 kHz 1 A

RRM

Non repetitive peak reverse current tp = 100 µs square 2 A

RSM

Repetitive peak avalanche power tp = 1 µs Tj = 25° C 2700 W

ARM

T

Storage temperature range

stg

TjMaximum operating junction temperature

(1)

-65 to + 175

175 °C

dV/dt Critical rate of rise of reverse voltage 10000 V/µs

Ptot

--------------

1. thermal runaway condition for a diode on its own heatsink

dTj

Table 2. Thermal resistances

1

--------------------------

<

Rth j a–()

Symbol Parameter Value Unit

2

PA K 3 .0

°C/W

R

th (j-c)

Junction to case

TO-220AC / D

TO-220FPAC 5.5

°C

Table 3. Static electrical characteristics (per diode)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

= 25° C

T

(1)

I

V

1. Pulse test: tp = 380 µs, δ < 2%

Reverse leakage current

R

(1)

Forward voltage drop

F

j

= 125° C 5 15 mA

T

j

= 125° C IF = 7.5 A 0.5 0.57

T

j

= 25° C IF = 15 A 0.84

j

= 125° C IF = 15 A 0.65 0.72

T

j

To evaluate the conduction losses use the following equation: P = 0.42 x I

2/9

F(AV)

+ 0.020 I

F2(RMS)

V

= V

R

RRM

VT

100 µA

STPS745 Characteristics

Figure 1. Average forward power dissipation

versus average forward current

P (W)

F(AV)

6

5

4

3

2

1

0

012345678910

δ = 0.05

δ = 0.1

δ = 0.2

I (A)

F(AV)

δ = 0.5

δ

=tp/T

δ = 1

T

tp

Figure 3. Normalized avalanche power

derating versus pulse duration

P(t)

ARM p

P (1µs)

ARM

1

0.1

0.01

t (µs)

0.001

0.10.01 1

p

10 100 1000

Figure 5. Non repetitive surge peak forward

current versus overload duration (maximum values) (TO-220AC and D

2

PAK )

Figure 2. Average forward current versus

ambient temperature (

I (A)

F(AV)

9

R=R

8

7

6

5

R =40°C/W

δ

=tp/T

th(j-a)

T

tp

4

3

2

1

0

0 25 50 75 100 125 150 175

th(j-a) th(j-c)

R =15°C/W

th(j-a)

T (°C)

amb

δ = 0.5)

TO-220AC

TO-220FPAC

Figure 4. Normalized avalanche power

derating versus junction temperature

P(t)

ARM p

P (25°C)

ARM

1.2

1

0.8

0.6

0.4

0.2

0

25 50 75 100 125 150

T (°C)

j

Figure 6. Non repetitive surge peak

forwardcurrent versus overload duration (maximum values) (TO-220FPAC)

I (A)

M

120

100

80

60

40

IM

20

0

1E-3 1E-2 1E-1 1E+0

δ=0.5

t

t(s)

T =50°C

T =100°C

C

T =150°C

C

I (A)

M

80

70

60

50

C

40

30

20

IM

10

0 1E-3 1E-2 1E-1 1E+0

δ=0.5

t

t(s)

3/9

T =50°C

C

T =100°C

C

T =150°C

C