ST STPS20L45C User Manual

STPS20L45C

Low drop power Schottky rectifier

Main product characteristics

IF(AV)	2 x 10 A
VRRM	45 V
Tj (max)	150° C
VF(max)	0.5 V

Features and benefits

■Low forward voltage drop meaning very small conduction losses

■Low switching losses allowing high frequency operation

■Insulated package: TO-220FPAB Insulating voltage = 2000 V DC Capacitance = 12 pF

■Avalanche capability specified

Description

Dual center tap Schottky rectifiers designed for high frequency switched mode power supplies and DC to DC converters.

These devices are intended for use in low voltage, high frequency inverters, free-wheeling and polarity protection applications.

	A1
		K
	A2
	A2	A2
	K
		K
	A1
		A1
	TO-220FPAB	TO-220AB
	STPS20L45CFP	STPS20L45CT
	K
		A2
		A1
		D2PAK
	STPS20L45CG

March 2007

Rev 4

1/9

www.st.com

Characteristics	STPS20L45C

1 Characteristics

Table 1.			Absolute Ratings (limiting values)
Symbol				Parameter			Value	Unit
	VRRM		Repetitive peak reverse voltage				45	V
IF(RMS)			RMS forward voltage				30	A
				2	Tc =135° C	Per diode	10
	IF(AV)		Average forward	TO-220AB / D PAK	δ = 0.5	Per device	20	A
			current
				TO-220FPAB	Tc = 115° C	Per diode	10	A
					δ = 0.5	Per device	20
	IFSM		Surge non repetitive forward current		tp = 10 ms Sinusoidal		180	A
	IRRM		Peak repetitive reverse current		tp = 2 µs square F = 1 kHz		1	A
	IRSM		Non repetitive peak reverse current		tp = 100 µs square		2	A
	PARM		Repetitive peak avalanche power		tp = 1 µs Tj = 25°C		4000	W
	Tstg		Storage temperature range				-65 to + 150	°C
	T		Maximum operating junction temperature (1)				150	°C
	j
	dV/dt		Critical rate of rise of reverse voltage				10000	V/µs
1.	dPtot		1
	dTj	< Rth(j – a) condition to avoid thermal runaway for a diode on its own heatsink
	---------------		-------------------------

Table 2.

Thermal resistances

Symbol

Parameter

Value

Unit

Per diode

4.5

Rth(j-c)

Junction to case

TO-220FPAB

Total

3.5

°C/W

Coupling

2.5

TO-220AB / D2PAK

Per diode

2.2

Rth(j-c)

Junction to case

Total

1.3

°C/W

Coupling

0.3

When the diodes 1 and 2 are used simultaneously :

Tj(diode 1) = P(diode1) x Rth(j-c)(Per diode) + P(diode 2) x Rth(c).

Table 3.

Static electrical characteristics (per diode)

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

IR(1)

Reverse leakage current

Tj = 25° C

VR = VRRM

0.2

mA

Tj = 125° C

65

130

mA

Tj = 25° C

IF = 10 A

0.55

VF(1)

Forward voltage drop

Tj = 125° C

IF = 10 A

0.44

0.5

V

Tj = 25° C

IF = 20 A

0.73

Tj = 125° C

IF = 20 A

0.62

0.72

1. Pulse test: tp = 380 µs, δ < 2%

To evaluate the conduction losses use the following equation:

P = 0.28 x IF(AV) + 0.022 IF2(RMS)

2/9

STPS20L45C	Characteristics
Figure 1. Average forward power	Figure 2. Average forward current versus
dissipation versus average forward	ambient temperature
current (per diode)	(δ = 0.5, per diode)

PF(AV)(W)								12	IF(AV)(A)
8
7		δ = 0.1	δ = 0.2	δ = 0.5				11					Rth(j-a)=Rth(j-c)	TO-220AB / TO-247
								10
	δ = 0.05
6								9
													TO-220FPAB
5								8			Rth(j-a)=15°C/W
								7
						δ = 1
4								6
3								5
								4
2							T	3		T
1								2
			IF(AV)(A)			δ=tp/T	tp	1	δ=tp/T	tp		Tamb(°C)
0								0
0	2	4	6	8	10	12	14		0	25	50	75	100	125	150

Figure 3. Normalized avalanche power	Figure 4. Normalized avalanche power
derating versus pulse duration	derating versus junction
	temperature

PARM(tp)							PARM(tp)
PARM(1µs)
						PARM(25°C)
1
						1.2
						1
0.1						0.8
						0.6
0.01						0.4
						0.2
			tp(µs)						Tj(°C)
0.001						0
0.01	0.1	1	10	100	1000	25	50	75	100	125	150

Figure 5. Non repetitive surge peak forward Figure 6.	Non repetitive surge peak forward
current versus overload duration	current versus overload duration
(maximum values, per diode,	(maximum values, per diode,
TO-220AB, D2PAK)	TO-220FPAB)

IM(A)				IM(A)
140				100
120				90
				80
100				70
80				60
							Tj=25°C
			TC=25°C	50
60			TC=75°C	40
							TC=50°C
40				30
IM			TC=125°C	20	IM		TC=100°C
20	t	t(s)		10	t	t(s)
	δ=0.5				δ=0.5
0
				0
1E-3	1E-2	1E-1	1E+0	1E-3	1E-2	1E-1	1E+0

3/9