Datasheet SI-8405L Datasheet (Sanken Electric Co)

●SI-8400L/8500L Series

SI-8400L/8500L Series

Separate Excitation Switching Type with Coil

■Features

• Integrated switching IC and coil construction

• Requires 2 external components only

• Low switching noise

• Heatsink not required

• Built-in overcurrent and thermal protection circuits

• Built-in soft start circuit (Output ON/OFF control)...SI-8500L Series

■Applications

• Telephone power supplies

• Onboard local power supplies

■Lineup

Part Number SI-8401L SI-8402L SI-8403L SI-8405L SI-8501L SI-8502L SI-8503L SI-8504L SI-8505L

VO(V) 5.0 12.0 3.3 15.0 5.0 12.0 3.3 9.0 15.0

IO(A) 0.5 0.4 0.5 0.4 1.0

■Absolute Maximum Ratings

Parameter

DC Input Voltage
Power Dissipation
Junction Temperature
Storage T emperature

Symbol

VIN

PD

Tj

Tstg

SI-8400L SI-8500L

1.25 3

Ratings

35

+100

–25 to +85

Unit

V

W

°C
°C

■Recommended Operating Conditions

Parameter

DC Input Voltage Range
Output Current Range
Operating Temperature Range

Parameter

DC Input Voltage Range
Output Current Range
Operating Temperature Range

Symbol

VIN

IO

Top

Symbol

VIN

IO

Top

Ratings

SI-8401L SI-8402L SI-8403L SI-8405L

7 to 33 15 to 33 5.3 to 33 18 to 33

0 to 0.5 0 to 0.4 0 to 0.5 0 to 0.4

–20 to +85

Ratings

SI-8501L SI-8502L SI-8503L SI-8504L SI-8505L

7 to 33 15 to 33 5.3 to 33 12 to 33 18 to 33

0 to 1.0

–20 to +85

Unit

V
A

°C

Unit

V
A

°C

96

●SI-8400L/8500L Series

■Electrical Characteristics

Parameter

Output Voltage

Efficiency

Switching Frequency

Line Regulation

Load Regulation

Temperature Coefficient of Output Voltage
Switching Ripple
Voltage (C2=470µF)
Overcurrent Protection
Starting Current

Parameter

Output Voltage

Efficiency

Switching Frequency

Line Regulation

Load Regulation

Temperature Coefficient of Output Voltage
Switching Ripple
Voltage (C2=470µF)
Overcurrent Protection
Starting Current

Symbol

Conditions

Conditions

Conditions

∆VOLINE

Conditions

∆VOLOAD

Conditions

∆VO/∆Ta

∆Vr

Conditions

Conditions

Symbol

Conditions

Conditions

Conditions

∆VOLINE

Conditions

∆VOLOAD

Conditions

∆VO/∆Ta

∆Vr

Conditions

Conditions

VO

η

f

IS1

VO

η

f

IS1

Ratings

SI-8401L SI-8402L SI-8403L SI-8405L

min. typ. max. min. typ. max. min. typ. max. min. typ. max.

4.80 5.00 5.20 11.40 12.00 12.60 3.17 3.30 3.43 14.25 15.00 15.75
VIN=20V, IO=0.3A VIN=24V, IO=0.3A VIN=15V, IO=0.3A VIN=27V, IO=0.3A

80 88 75 89

VIN=20V, IO=0.3A VIN=24V, IO=0.3A VIN=15V, IO=0.3A VIN=27V, IO=0.3A

60 60 60 60

VIN=20V, IO=0.3A VIN=24V, IO=0.3A VIN=15V, IO=0.3A VIN=27V, IO=0.3A

80 100 100 130 60 80 100 130

VIN=10 to 30V, IO=0.3A VIN=18 to 30V, IO=0.3A VIN=8 to 30V, IO=0.3A VIN=21 to 30V, IO=0.3A

30 40 70 95 20 30 90 120

VIN=20V, IO=0.1 to 0.4A VIN=24V, IO=0.1 to 0.4A VIN=15V, IO=0.1 to 0.4A VIN=27V, IO=0.1 to 0.4A

±0.5 ±1.5 ±0.5 ±1.5

20 40 35 70 15 30 40 80

VIN=20V, IO=0.3A VIN=24V, IO=0.3A VIN=15V, IO=0.3A VIN=27V, IO=0.3A

0.55 0.45 0.55 0.45

VIN=10V VIN=18V VIN=8V VIN=21V

Ratings

SI-8501L SI-8502L SI-8503L SI-8504L SI-8505L

min. typ. max. min. typ. max. min. typ. max. min. typ. max. min. typ. max.

4.80 5.00 5.20 11.40 12.00 12.60 3.17 3.30 3.43 8.55 9.00 9.45 14.25 15.00 15.75
VIN=20V, IO=0.5A VIN=24V, IO=0.5A VIN=15V, IO=0.5A VIN=21V, IO=0.5A VIN=25V, IO=0.5A

83 89 79 87 90

VIN=20V, IO=0.5A VIN=24V, IO=0.5A VIN=15V, IO=0.5A VIN=21V, IO=0.5A VIN=25V, IO=0.5A

60 60 60 60 60

VIN=20V, IO=0.5A VIN=24V, IO=0.5A VIN=15V, IO=0.5A VIN=21V, IO=0.5A VIN=25V, IO=0.5A

70 130 70 130 50 80 70 130 70 130

VIN=10 to 30V, IO=0.5A VIN=18 to 30V, IO=0.5A VIN=8 to 30V, IO=0.5A VIN=15 to 30V, IO=0.5A VIN=21 to 30V, IO=0.5A

30 55 30 55 20 45 30 55 30 55

VIN=20V, IO=0.2 to 0.8A VIN=24V, IO=0.2 to 0.8A VIN=15V, IO=0.2 to 0.8A VIN=21V, IO=0.2 to 0.8A

±0.5 ±1.5 ±0.5 ±1.0 ±1.5

45 30 15 25 30

VIN=20V, IO=0.5A VIN=24V, IO=0.5A VIN=15V, IO=0.5A VIN=21V, IO=0.5A VIN=25V, IO=0.5A

1.1 1.1 1.1 1.1 1.1
VIN=18V VIN=24V VIN=12V VIN=21V VIN=25V

VIN=25V, IO=0.2 to 0.8A

(Ta=25°C)

Unit

V

%

kHZ

mV

mV

mV/°C

mVp-p

A

(Ta=25°C)

Unit

V

%

kHZ

mV

mV

mV/°C

mVp-p

A

97

●SI-8400L/8500L Series

■Outline Drawing

IN

rV

a

b

14.5

±0.5

q

Vo

Terminal 1 marking

φ

0.8max.

(10.16) (7.62) (2.19)(2.17)

■Block Diagram

SI-8400L SI-8500L

V

IN

IN

L

y

r

e

L

IN

±0.5

12

GND

w

±0.6

13.2

±0.2

10

±0.6

4.7

a. Part Number
b. Lot Number
Open Air Type
Weight: Approx. 5.1g

a

b

SK

qwe

V

OUT

SS GND

±0.1

26

Terminal 1 marking

0.6

φ

418

±0.1

18

3.7

(unit:mm)

a. Part Number
b. Lot Number

26

Open Air Type
Weight: Approx. 14.5g

2

SI-8400L SI-8500L

41

IN VO

V

MIC1

Reg. OCP

OSC Reset

Comp.

Amp.

■Standard External Circuit

3

LIN

L1

61

V

IN

MIC

1

4

L

IN

L

1

V

O

Reg. OCP

Latch
Drive

TSD

&

OSC Reset

Comp.

Di1

Latch

&

Drive

TSD

Di

1

Amp.

V

REF

2

GND

S.S.

V

REF

32

GND

V

GND

IN

++

C

1

220µF

IN

V

SI-8400L

2

Pin compatible with SI-8200L

98

V

OUT

14

LINGND

3

N.C

V

O

C

2

470µF

GND

V

V

GND

IN

++

C

1

470µF

IN

V

SI-8500L

2

C

3

OUT

LINGNDS.S

34

N.C

16

C3 is necessary only for using soft start function.
Pin compatible with SI-8300L

C

470µF

V

O

2

GND

■Ta-PD Characteristics

1.5

SI-8400L

3.0

SI-8500L

●SI-8400L/8500L Series

100

PD=VO•IO

ηχ

–1

(W)

D

1.0

0.5

Power Dissipation P

0

02550

Ambient Temperature Ta (°C)

75 100

(W)

D

2.0

1.0

Power Dissipation P

0

0 25 50 75 100

Ambient Temperature Ta (°C)

■SI-8500L application circuit

Terminal no.2 is for soft start. Connecting a capacitor to the terminal
enables the soft start function. See page 85 for the f ormulas to calcu­late delay time and rise time. Output can be turned on and off by
using the soft start terminal. To stop output, set the soft start terminal
voltage to VSSL (0.2V typ.) or less. To switch the potential of the soft
start terminal, drive the open collector of the transistor. Since the
discharge current from C3 flows to the ON/OFF control transistor , limit
the current for protection. The SS terminal is pulled up to the power
supply in the IC and no external voltage can be applied.

VO :Output voltage
IO :Output current
ηχ :Efficiency (%)

The efficiency depends on the input
voltage and the output current. Thus,
obtain the value from the efficiency
graph and substitute the percentage
in the formula above.

SI-8500L SI-8500L

S.S.2 S.S.2 S.S.

C

3

O.

ON/OFF Soft start Soft start +VO ON/OFF

V

SI-8500L

2

3

C

■Caution

1. Allocation of Components
For the best operating environment, the ground should be a single g round line at the GND terminal (terminal 2 on the SI-8400L, terminal 3 on
the SI-8500L), and the wiring from C1 and C2 to ground should be as short as possible.

2. Capacitors C1 and C2

1) They must satisfy the breakdown voltage and allowable ripple current.
Exceeding the ratings of these capacitors or using them without derating shortens their service lives and may also cause abnormal
oscillation of the IC.

2) C2 must be a low-impedance type capacitor to ensure minimum ripple voltage and stable switching operation.

3) C3 (SI-8500L only) is a capacitor for soft start. When not using soft start, leave terminal 2 open. It is pulled up inside the IC.

3. Terminals LIN and NC in the connection diagram must be left unconnected to other circuits.

4. The IC's metalic heatsink is electrically floating. Do not connect it to GND or any other circuit.

5. Since the SI-8400L and 8500L series have an open-package construction, they can only be operated in specific environments. Verify the
operating environment and use the conditions indicated in the reliability data.

99

●SI-8400L/8500L Series

■Typical Characteristics (SI-8400L Series)

Rise Characteristics(SI-8401L) Efficiency Characteristics(SI-8401L) Load Regulation(SI-8401L)

T

a

6

5

(V)

O

4

3

2

0.1A

=0A

O

I

0.5A

0.3A

=25°C

Output Voltage V

1

0

0

246

810

Input Voltage VIN (V)

Temperature Characteristics(SI-8401L)

100

90

80

70

60

50

40

Efficiency η (%) Frequency f (kHz)

00

–40

–20 0 20

Ambient Temperature Ta (°C)

VIN=20V, IO=0.3A

η

V

O

f

40 60 80 100

100

Efficiency η (%)

5.3

5.2

5.1

(V)

O

5.0

4.9

4.8

Output Voltage V

4.7

90

80

V

IN

7V

10V

70

20V
25V

60

33V

50

0

0

0.1 0.2 0.3 0.4 0.5

Output Current IO (A)

Overcurrent Protection Characteristics(SI-8401L) Thermal Protection Characteristics(SI-8401L)

6

5

(V)

O

4

3

2

Output Voltage V

1

0

0

20V

=7V

IN

V

33V

0.5 1.0 1.5 2.0

Output Current IO (A)

T

T

a

=25°C

a

=25°C

20V
25V
33V
10V
7V

5.3

5.2

(V)

5.1

O

5.0

4.9

Output Voltage V

4.8

0

0

0.1 0.2 0.3 0.4 0.5

6

5

(V)

4

O

3

2

Output Voltage V

1

0

0

50 100

Case Temperature TC (°C)

VIN=33V

10V

7V

Output Current IO (A)

20V

IN

=20V, IO=20mA

V

150 200

T

a

=25°C

Note on Thermal Protection:

The thermal protection circuit is intended for pro­tection against heat during instantaneous short­circuiting. Its operation is not guaranteed for short­circuiting over extended periods of time.

Rise Characteristics(SI-8402L) Efficiency Characteristics(SI-8402L) Load Regulation(SI-8402L)

14

12

10

(V)

O

8

6

4

Output Voltage V

2

0

0

510

Input Voltage VIN (V)

0.2A

O

I

=0A

0.4A

T

a

=25°C

15 20

100

90

80

70

60

Efficiency η (%)

=15V

IN

V

24V

33V

50

0

0

0.1 0.2 0.3 0.4

Output Current IO (A)

Ta=25°C

12.3

12.2

(V)

12.1

O

12.0

11.9

Output Voltage V

11.8

0

0.1 0.2 0.3 0.4

0

V

IN

=33V

24V
20V

15V

Output Current IO (A)

Ta=25°C

100

■Typical Characteristics (SI-8500L Series)

●SI-8400L/8500L Series

Rise Characteristics(SI-8501L) Efficiency Characteristics(SI-8501L) Load Regulation(SI-8501L)

T

a

a=25°C

7

6

5

4

3

2

Output Voltage VO (V)

1

0

0.5A

=0A

O

1A

I

0

5101520

Input Voltage VIN (V)

T

Temperature Characteristics(SI-8401L)

V

IN

100

90

80

70

60

50

40

Efficiency η (%) Frequency f (kHz)

0

–40

0 40 80 120

Ambient Temperature Ta (°C)

=20V, IO=0.5A

η

V

O

f

100

Efficiency η (%)

5.15

5.10

5.05

(V)

O

5.00

4.95

4.90

Output Voltage V

4.85

0

90

=7V

IN

V

80

20V

33V

70

60

50

40

0

0.25 0.5 0.75 1

0

Output Current IO (A)

Overcurrent Protection Characteristics(SI-8401L) Thermal Protection Characteristics(SI-8401L)

7

6

5

(V)

O

4

3

2

Output Voltage V

1

0

0

1234

33V

=7V

20V

IN

V

Output Current IO (A)

=25°C

Ta=25°C

5.15

5.10

5.05

5.00

4.95

4.90

Output Voltage VO (V)

4.85

0

0

7

6

5

(V)

O

4

3

2

Output Voltage V

1

0

0

V

IN

=33V

20V

15V

7V

0.25 0.5 0.75 1

Output Current IO (A)

40 80 120 160

Ambient Temperature Ta (°C)

a=25°C

T

VIN=20V, IO=0A

Note on Thermal Protection:

The thermal protection circuit is intended for pro­tection against heat during instantaneous short­circuiting. Its operation is not guaranteed for short­circuiting over extended periods of time.

Rise Characteristics(SI-8502L) Efficiency Characteristics(SI-8502L) Load Regulation(SI-8502L)

14

12

10

(V)

O

8

6

4

Output Voltage V

2

0

0

5101520

Input Voltage VIN (V)

0.5A

=0A

O

I

Ta=25°C

1A

100

Efficiency η (%)

90

=15V

IN

V

33V

80

24V

70

60

50

40

0

0.25 0.5 0.75 1.0

0

Output Current IO (A)

Ta=25°C

Output Voltage VO (V)

12.3

12.2

12.1

12.0

11.9

11.8

11.7

18V

15V

24V

VIN=33V

0

0.25 0.5 0.75 1

0

Output Current IO (A)

Ta=25°C

101