102
s
Features
Integrated switching IC and transformer construction
Requires only input/output and soft start capacitors as external components
Low switching noise
Heatsink not required
Built-in overcurrent protection circuit (+5V)
2output lineup (SI-8811L, SI-8911L)
s
Applications
Telephone power supplies
Onboard local power supplies
s
Lineup
Separate Excitation Switching Type with Transformer
Unit
V
W
C
C
SI-8800L/8900L Series
s
Absolute Maximum Rating
Unit
V
mA
mA
C
Symbol
V
IN
I
O1
I
O2
T
op
*1: Output current 2 depends on the input/output conditions
*2: If I
O2
=50mA or more, the condition I
O1
>0.5
I
O2
is recommended.
s
Recommended Operating Conditions
Parameter
DC Input Voltage Range
Output Current Range 1
Output Current Range 2
Operating Temperature Range
Parameter
DC Input Voltage
Power Dissipation
Junction Temperature
Storage Temperature
Part Number
SI-8811L
SI-8911L
SI-8921L/8922L
Ch1
Ch2
V
O
(V)
I
O
(A)
V
O
(V)
I
O
(A)
+5
0.45
5
0.05
+5
0.3
5
0.1
+5
0.6
Symbol
V
IN
P
D
T
j
T
stg
Ratings
SI-8811L
SI-8911L
SI-8921L
SI-8922L
35
60
1.15
1.3
1.67
1.67
+100
25 to +85
Ratings
SI-8811L
SI-8911L
SI-8921L
SI-8922L
min.
typ.
max.
min.
typ.
max.
min.
typ.
max.
min.
typ.
max.
12
20
30
24
40
55
24
40
55
20
40
55
50
250
450
20
150
300
*2
0
300
600
0
300
600
0
20
50
*1
0
50
100
10
+70
10
+60
10
+65
10
+65
q
SI-8800L/8900L Series
103
s
Electrical Characteristics
(T
a
=25
C)
Unit
V
%
kH
Z
mV
p-p
mV
p-p
V
Symbol
V
O1
Conditions
V
O2
Conditions
Conditions
f
V
r1
Conditions
V
r2
Conditions
V
St
Conditions
s
Outline Drawing
a. Part Number
b. Lot Number
Open Air Type
Weight: Approx. 9.3g
SK
q
t
o
y
16.8
0.2
22
0.2
19
0.2
22
0.2
,,,,,,,,,,,
,,,,,,,,,,
18
0.6
1
0.1
4
0.6
0.8max.
(16.5)
(4
P3.175=12.7)
a
b
Terminal 1 marking
SI-8811L, 8911L, 8921L, 8922L
Parameter
Output Voltage 1
Output Voltage 2
Efficiency
Switching Frequency
Switching Ripple
Voltage 1
Switching Ripple
Voltage 2
Operation Starting
Voltage
Ratings
SI-8811L
SI-8911L
SI-8921L
SI-8922L
min.
typ.
max.
min.
typ.
max.
min.
typ.
max.
min.
typ.
max.
4.75
5.00
5.25
4.75
5.00
5.25
4.95
5.10
5.20
4.95
5.10
5.20
Recommended operating conditions
4.75
5.00
5.25
4.75
5.00
5.25
Recommended operating conditions
72
65
72
72
Recommended operating conditions (typ.)
50
68
60
68
80
60
68
80
50
50
50
80
50
80
Recommended operating conditions (typ.)
50
50
Recommended operating conditions (typ.)
22
24
22
24
17
20
Recommended operating conditions (typ.)
q
SI-8800L/8900L Series
(unit: mm)
104
s
Standard External Circuit
SI-8811L
SI-8911L
s
Block Diagram
SI-8921L/8922L
V
IN
(+)
T
r1
V
O1
1
4
2 S.S
5
6
3
9
8
7
V
O2
GND
T
1
V
IN
()
OSC
OCP
Reg.
Drive
Vref
Amp.
PWM
Start
3
1
Amp.
PWM
9
OSC
OCP
Reg.
Drive
Vref
Start
2 S.S
T
r1
T
1
V
O1
V
O2
GND
5
4
7
6
8
V
IN
3
1
Amp.
PWM
7
OSC
OCP
Drive
Vref
Start
2 S.S
T
r1
T
1
V
O
V
IN
GND
5
6
SI-8811L
V
IN
V
O1
V
O2
GND
C
1
C
2
1
2
3
4
5
9
8
7
6
C
4
C
5
C
3
(+)
V
IN
()
+
+
+
+
+
SI-8911L
V
IN
V
O1
V
O2
GND
GND
C
1
C
2
C
3
1
2
3
4
5
9
8
C
5
C
4
+
+
+
+
+
6
7
SI-8921L
SI-8922L
V
IN
V
O
GND
GND
C
1
C
2
1
2
3
4
7
6
C
3
+
+
+
5
q
SI-8800L/8900L Series
C
1
(for smoothing V
IN
)
: 35V/470
F
C
2
(for soft start)
: 16V/10
F
C
3
(for smoothing V
O2
Reg input) : 10V/220
F
C
4
(for smoothing V
O1
)
: 16V/1200
F
C
5
(for smoothing V
O2
)
: 10V/47
F
C
1,2,3,5
: Nippon Chemi-con SME Series or equivalent
C
4
: Nippon Chemi-con SXE Series or equivalent
C
1
(for smoothing V
IN
)
: 63V/220
F
C
2
(for soft start)
: 10V/33
F
C
3
(for smoothing V
O2
Reg input) : 10V/220
F
C
4
(for smoothing V
O1
)
: 16V/1200
F
C
5
(for smoothing V
O2
)
: 10V/100
F
C
1,2,3,5
: Nippon Chemi-con SME Series or equivalent
C
4
: Nippon Chemi-con SXE Series or equivalent
C
1
(for smoothing V
IN
)
: 63V/180
F
C
2
(for soft start)
: 10V/22
F
C
3
(for smoothing V
O2
)
: 10V/1200
F
C
1,2
: Nippon Chemi-con SME Series or equivalent
C
3
: Nippon Chemi-con SXE Series or equivalent
105
s
T
a
-P
D
Characteristics
s
Caution
1. A low-impedance capacitor suitable for switching applications must be used for the external capacitor and must be connected as close to the
IC as possible in order to assure low ripple voltage and stable switching operation.
2. The SI-881L/8911L series does not have a built-in overcurrent protection circuit on terminal V
O2
(5V). Thus, avoid short-circuit conditions that
may cause an overcurrent.
3. Do not connect V
IN
() of SI-8811L to GND. The overcurrent protection circuit may not work if they are connected.
4. Terminals left unconnected in the connection diagram must not be connected to other circuits.
5. The IC's metallic heatsink is electrically floating. Do not connect it to GND or any other circuit.
6. Since the SI-8800L and 8900L series have an open-package construction, they can be operated in specific environments. Verify the operating
environment and use the IC within the conditions indicated in the reliability data.
1.5
1.0
0.5
0
0
25
50
Ambient Temperature T
a
(
C)
Power Dissipation P
D
(W)
75
100
SI-8811L
SI-8911L
SI-8911L
SI-8921L 8922L
SI-8921L
1.5
1.0
0.5
0
0
25
50
Ambient Temperature T
a
(
C)
Power Dissipation P
D
(W)
75
100
8922L
q
SI-8800L/8900L Series
V
O
:Output voltage
I
O
:Output current
: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.
P
D
=V
O
I
O
100
1
106
s
Typical Characteristics
SI-8811L
SI-8911L
SI-8921L
Rise Characteristics
Rise Characteristics
Rise Characteristics
Efficiency Characteristics
Efficiency Characteristics
Efficiency Characteristics
Input Voltage V
IN
(V)
V
O
2 (V) Output Voltage V
O
1 (V)
6
4
2
0
2
4
6
2
4
6
8
10 12
14 16 18
20
l
O
1=50mA l
O
2 =0mA
l
O
1=250mA l
O
2 =20mA
l
O
1=450mA l
O
2 =50mA
l
O
1=50mA l
O
2 =0mA
l
O
1=250mA l
O
2 =20mA
l
O
1=450mA l
O
2 =50mA
V
IN
(V)
0 50
250
100
150 200
300
400 450
350
500
Output Current 1 l
O
1 (A)
Efficiency
(%)
80
75
70
65
60
0
I
O
2 = 50mA constant
V
IN
=12V
15V
20V
25V
30V
6
4
2
0
2
4
6
5
10
15
20
25
30
35
40
V
IN
(V)
Input Voltage V
IN
(V)
V
O
2 (V) Output Voltage V
O
1 (V)
l
O
1
20 to 30mA
l
O
2
0 to 100mA
0
200
50
100
150
250
300
350
400
80
70
60
50
40
30
0
Output Current 1 l
O
1 (A)
Efficiency
(%)
I
O
2 = 100mA constant
V
IN
=55V
40V
24V
0
20
5
10
15
25
30
35
45
40
6
5
4
3
2
1
0
0.6A
l
O
=0
0.3A
Input Voltage V
IN
(V)
Output Voltage V
O
(V)
0
0.4
0.1
0.2
0.3
0.5
0.6
0.7
0.8
80
70
60
50
40
30
20
0
Output Current l
O
(A)
Efficiency
(%)
V
IN
=55V
48V
40V
30V
24V
SI-8922L
Rise Characteristics
0
8
7
6
5
4
3
2
1
0
10
20
Input Voltage V
IN
(V)
Output Voltage V
O
(V)
30
40
I
O
=0.4A
0.5A
0.6A
0
70
80
60
50
40
30
20
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Output Current l
O
(A)
Efficiency
(%)
V
IN
=55V
48V
40V
30V
24V
(T
a
=25
C)
q
SI-8800L/8900L Series
Efficiency Characteristics
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