ST STPS2045CH User Manual

Features

■ Very small conduction losses

■ Avalanche rated

■ Low forward voltage drop

■ High frequency operation

Description

This device is a dual diode Schottky rectifier,
suited to high frequency switch mode power
supply.

Packaged in IPAK, this device is intended to be
used in notebook, game station and desktop
adapters, providing in these applications a good
efficiency at both low and high load.

Figure 1. Electrical characteristics

2 x I

I

"Forwar d"

O

I

F

I

O

I

R

V

V

F(Io)

To

V

I

V

RRM

V

V

AR

R

"Reverse"

(a)

X

X

V

V

V

F(2xIo)

F

STPS2045CH

Power Schottky rectifier

Datasheet − production data

A1

A2

IPAK

STPS2045CH

Table 1. Device summary

Symbol Value

I

2 x 10 A

F(AV)

V

RRM

175 °C

T

j (max)

V

F (max)

K

A1

A2

K

0.57 V

45 V

I

AR

a. V

ARM

and I

must respect the reverse safe

ARM

operating area defined in Figure 8. V
pulse measurements (t
V

, are static characteristics

F

< 10 µs). VR, IR, V

p

and IAR are

AR

RRM

and

June 2012 Doc ID 023045 Rev 1 1/7

This is information on a product in full production.

www.st.com

7

Characteristics STPS2045CH

1 Characteristics

Table 2. Absolute ratings (limiting values, per diode)

Symbol Parameter Value Unit

V

I

F(RMS)

I

F(AV)

I

P

ARM

V

ARM

V

ASM

T

1. For pulse time duration deratings, please refer to Figure 4. More details regarding the avalanche energy measurements

2. See Figure 8

3. condition to avoid thermal runaway for a diode on its own heatsink

Table 3. Thermal resistance parameters

Repetitive peak reverse voltage 45 V

RRM

Forward rms voltage 20 A

T

= 155 °C Per diode 10

Average forward current δ = 0.5

Surge non repetitive forward current t

FSM

(1)

Repetitive peak avalanche power tp = 10 µs, Tj = 125 °C 280 W

(2)

Maximum repetitive peak avalanche voltage tp < 10 µs, Tj < 125 °C, IAR < 4.7 A 60 V

(2)

Maximum single-pulse peak avalanche voltage tp < 10 µs, Tj < 125 °C, IAR < 4.7 A 60 V

Storage temperature range -65 to + 175 °C

stg

T

Maximum operating junction temperature

j

and diode validation in the avalanche are provided in the application notes AN1768 and AN2025.

<

Rth(j-a)

1

dPtot

dTj

(3)

c

= 150 °C Per package 20

T

c

= 10 ms sine-wave 150 A

p

A

+ 175 °C

Symbol Parameter Value Unit

R

Junction to case

th (j-c)

R

Coupling 0.7 °C/W

th (c)

Per diode
To t al

2.50

1.6

°C/W

When the diodes 1 and 2 are used simultaneously:

ΔT

(diode 1) = P(diode1) x R

j

Table 4. Static electrical characteristics (per diode)

(Per diode) + P(diode 2) x R

th(j-c)

th(c)

Symbol Parameter Tests conditions Min. Typ. Max. Unit

(1)

I

R

V

1. Pulse test: tp = 5 ms, δ < 2%

2. Pulse test: t

Reverse leakage current

(2)

Forward voltage drop

F

= 380 µs, δ < 2%

p

T

= 25 °C

j

T

= 125 °C 7 15 mA

j

= 125 °C IF = 10 A 0.5 0.57

T

j

= 25 °C

j

= 125 °C 0.65 0.72

T

j

= V

V

R

I

= 20 A

F

RRM

100 µA

0.84

V T

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

F(AV)

+ 0.015 I

F2(RMS)

2/7 Doc ID 023045 Rev 1

STPS2045CH Characteristics

Figure 2. Average forward power dissipation

versus average forward current
(per diode)

P

(W)

F(AV)

9

8

7

6

5

4

3

2

1

0

02468101214

δ = 0.05

δ = 0.1

I

F(AV)

δ = 0.2

(A)

δ = 0.5

δ = tp/T

δ = 1

T

tp

Figure 4. Normalized avalanche power

derating versus pulse duration

P(tp)

ARM

(10 µs)

P

ARM

1

0.1

0.01

t (µs)

0.001
1 10 100 1000

p

Figure 3. Junction capacitance versus

reverse voltage applied
(typical values, per diode)

C(pF)

1000

500

200

V (V)

100

12 51020 50

R

F=1MHz

V =30mV

OSC RMS

T=25°C

j

Figure 5. Relative variation of thermal

impedance junction to case versus
pulse duration

Z

th(j -c)/Rth(j -c)

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

Single pulse

0.2

0.1

0.0

1.E-04 1.E-03 1.E-02 1.E-01 1.E+00

tP(s)

Figure 6. Reverse leakage current versus

reverse voltage applied
(typical values, per diode)

I (µA)

R

1.E+05

T=150°C

1.E+04

1.E+03

1.E+02

1.E+01

1.E+00

1.E-01
0 5 10 15 20 25 30 35 40 45

j

T=125°C

j

T=100°C

j

T=75°C

j

T=50°C

j

T=25°C

j

V (V)

R

Doc ID 023045 Rev 1 3/7

Figure 7. Forward voltage drop versus

forward current (per diode)

I (A)

FM

1000

T=125°C

j

(maximum values)

100

T=125°C

j

(typical values)

T=25°C

j

10

1

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8

(maximum values)

V (V)

FM

Characteristics STPS2045CH

Figure 8. Reverse safe operating area

(t

< 10 µs and Tj < 125 °C)

p

Iarm (A)

10.0

9.0

8.0

7.0

6.0

5.0

4.0

3.0
30 40 50 60 70 80

Varm (V)

Figure 9. Average forward current versus

ambient temperature
(δ = 0.5, per diode)

I

(A)

F(AV)

12

R

10

8

6

4

δ = tp/T

T

tp

2

0

0 25 50 75 100 125 150 175

th(j-a)=Rth(j-c)

T

(°C)

amb

4/7 Doc ID 023045 Rev 1

STPS2045CH Package information

2 Package information

● Epoxy meets UL94, V0

● Lead-free package

In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com
ECOPACK

Table 5. IPAK Dimensions

®

packages, depending on their level of environmental compliance. ECOPACK®

®

is an ST trademark.

.

Dimensions

Ref.

Millimeters Inches

Min. Typ. Max. Min. Typ. Max.

A 2.20 2.40 0.086 0.094

A1 0.90 1.10 0.035 0.043

A3 0.70 1.30 0.027 0.051

A

E

B2

L2

C2

B 0.64 0.90 0.025 0.035

B2 5.20 5.40 0.204 0.212

B3 0.95 0.037

B5 0.30 0.035

D

C 0.45 0.60 0.017 0.023

C2 0.48 0.60 0.019 0.023

H

L1

L

B3

B
V1

A1

D 6 6.20 0.236 0.244

E 6.40 6.60 0.252 0.260

e2.28 0.090

B5

e

G

C

A3

G 4.40 4.60 0.173 0.181

H 16.10 0.634

L 9 9.40 0.354 0.370

L1 0.8 1.20 0.031 0.047

L2 0.80 1 0.031 0.039

V1 10° 10°

Doc ID 023045 Rev 1 5/7

Ordering information STPS2045CH

3 Ordering information

Table 6. Ordering information

Order code Marking Package Weight Base qty Delivery mode

STPS2045CH S2045CH IPAK 0.35 g 75 Tube

4 Revision history

Table 7. Document revision history

Date Revision Changes

21-Jun-2012 1 First issue

6/7 Doc ID 023045 Rev 1

STPS2045CH

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Doc ID 023045 Rev 1 7/7