qSI-8800L/8900L
Series
SI-8800L/8900L Series
Separate Excitation Switching Type with Transformer
sFeatures
•
•
•
•
•
•
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)
±2–output
lineup (SI-8811L, SI-8911L)
sApplications
• Telephone power supplies
• Onboard local power supplies
sLineup
Part Number
V
O
(V)
SI-8811L
SI-8911L
SI-8921L/8922L
+5
+5
+5
Ch1
I
O
(A)
0.45
0.3
0.6
V
O
(V)
–5
–5
Ch2
I
O
(A)
0.05
0.1
sAbsolute
Maximum Rating
Parameter
DC Input Voltage
Power Dissipation
Junction Temperature
Storage Temperature
Symbol
SI-8811L
V
IN
P
D
T
j
T
stg
35
1.15
1.3
+100
–25 to +85
Ratings
SI-8911L
SI-8921L
60
1.67
1.67
SI-8922L
V
W
°C
°C
Unit
sRecommended
Operating Conditions
Ratings
Parameter
DC Input Voltage Range
Output Current Range 1
Output Current Range 2
Operating Temperature Range
Symbol
min.
V
IN
I
O1
I
O2
T
op
12
50
0
–10
SI-8811L
typ.
20
250
–20
max.
30
450
–50
*1
+70
min.
24
20
0
–10
SI-8911L
typ.
40
150
–50
max.
55
300
*2
–100
+60
–10
+65
–10
+65
min.
24
0
SI-8921L
typ.
40
300
max.
55
600
min.
20
0
SI-8922L
typ.
40
300
max.
55
600
V
mA
mA
°C
Unit
*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.
102
qSI-8800L/8900L
Series
sElectrical
Characteristics
Ratings
Parameter
Symbol
min.
Output Voltage 1
Output Voltage 2
Efficiency
Switching Frequency
Switching Ripple
Voltage 1
Switching Ripple
Voltage 2
Operation Starting
Voltage
V
O1
Conditions
V
O2
Conditions
η
Conditions
f
∆V
r1
Conditions
∆V
r2
Conditions
V
St
Conditions
50
22
50
50
–4.75
–5.00
72
–5.25
4.75
SI-8811L
typ.
5.00
max.
5.25
min.
4.75
–4.75
SI-8911L
typ.
5.00
–5.00
65
68
50
50
24
22
24
17
20
60
max.
5.25
–5.25
72
68
50
80
80
60
72
68
50
80
80
min.
4.95
SI-8921L
typ.
5.10
max.
5.20
min.
4.95
SI-8922L
typ.
5.10
max.
5.20
(T
a
=25°C)
Unit
V
Recommended operating conditions
Recommended operating conditions
%
kH
Z
mV
p-p
mV
p-p
V
Recommended operating conditions (typ.)
Recommended operating conditions (typ.)
Recommended operating conditions (typ.)
Recommended operating conditions (typ.)
sOutline
Drawing
SI-8811L, 8911L, 8921L, 8922L
o
y
(unit: mm)
±0.2
19
22
a
b
SK
±0.2
a. Part Number
b. Lot Number
Open Air Type
Weight: Approx. 9.3g
q
16.8
22
±0.2
t
±0.2
Terminal 1 marking
,,,,,,,,,,
,,,,,,,,,,,
0.8max.
(4×P3.175=12.7)
18
±0.6
4
±0.6
(16.5)
1
±0.1
103
qSI-8800L/8900L
Series
sBlock
Diagram
SI-8811L
V
IN
(+)
1
T
r1
Amp.
Vref
T
1
GND
8
OSC
V
IN
(–)
4
2 S.S
5
6
Start
PWM
Drive
V
O2
7
3
V
O1
9
SI-8911L
9
V
IN
1
3
Amp.
Vref
PWM
T
r1
V
O2
Start
2 S.S
OCP
5
4
–Reg.
6
T
1
GND
7
V
O1
8
OSC
Reg.
Drive
OCP
SI-8921L/8922L
7
V
IN
1
3
Amp.
Vref
OSC
Start
2 S.S
PWM
Drive
T
r1
GND
5
T
1
V
O
6
OCP
sStandard
External Circuit
V
IN
(+)
1
+
C
1
C
2
V
IN
(–)
+
2
3
9
+
V
O1
C
4
GND
SI-8811L
8
C
1
(for smoothing V
IN
)
: 35V/470µF
C
2
(for soft start)
: 16V/10µF
C
3
(for smoothing V
O2
Reg input) : 10V/220µF
C
4
(for smoothing V
O1
)
C
5
(for smoothing V
O2
)
: 16V/1200µF
: 10V/47µF
+
C
5
V
O2
4
7
+
C
3
5
6
C
1,2,3,5
: Nippon Chemi-con SME Series or equivalent
C
4
: Nippon Chemi-con SXE Series or equivalent
V
IN
1
2
+
C
1
C
2
C
3
+
+
9
C
1
(for smoothing V
IN
)
C
2
(for soft start)
V
O1
+
+
C
4
GND
C
5
V
O2
: 63V/220µF
: 10V/33µF
3
SI-8911L
8
4
5
7
6
C
3
(for smoothing V
O2
Reg input) : 10V/220µF
C
4
(for smoothing V
O1
)
: 16V/1200µF
C
5
(for smoothing V
O2
)
: 10V/100µF
C
1,2,3,5
: Nippon Chemi-con SME Series or equivalent
C
4
: Nippon Chemi-con SXE Series or equivalent
GND
V
IN
1
2
SI-8921L
7
+
C
1
C
2
+
3
SI-8922L
6
4
5
+
C
3
V
O
C
1
(for smoothing V
IN
)
C
2
(for soft start)
C
3
(for smoothing V
O2
)
C
1,2
C
3
: 63V/180µF
: 10V/22µF
: 10V/1200µF
GND
: Nippon Chemi-con SME Series or equivalent
: Nippon Chemi-con SXE Series or equivalent
GND
104
qSI-8800L/8900L
Series
sT
a
-P
D
Characteristics
SI-8811L
1.5
SI-8921L
1.5
8922L
Power Dissipation P
D
(W)
P
D
=V
O
•I
O
100
–1
ηχ
Power Dissipation P
D
(W)
SI-8911L
1.0
1.0
V
O
:Output voltage
I
O
: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-8911L
SI-8921L
8922L
75
0.5
0.5
0
0
25
50
75
100
0
0
25
50
100
Ambient Temperature T
a
(°C)
Ambient Temperature T
a
(°C)
sCaution
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.
105
qSI-8800L/8900L
Series
sTypical
Characteristics
(T
a
=25°C)
SI-8811L
Rise Characteristics
6
6
SI-8911L
Rise Characteristics
6
SI-8921L
Rise Characteristics
l
O
=0
0.6A
V
O
2 (V) Output Voltage V
O
1 (V)
V
O
2 (V) Output Voltage V
O
1 (V)
4
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
20 (V)
4
5
Output Voltage V
O
(V)
l
O
1
20 to 30mA
2
V
IN
40 (V)
0.3A
4
2
0
0
3
2
4
6
8
10 12
14 16 18
5
10
15
20
25
30
35
–2
l
O
1=50mA l
O
2 =0mA
l
O
1=250mA l
O
2 =–20mA
l
O
1=450mA l
O
2 =–50mA
–2
l
O
2
0 to 100mA
–4
2
–4
1
–6
–6
Input Voltage V
IN
(V)
Input Voltage V
IN
(V)
0
0
5
10
15
20
25
30
35
40
45
Input Voltage V
IN
(V)
Efficiency Characteristics
80
V
IN
=12V
15V
20V
25V
30V
Efficiency Characteristics
80
Efficiency Characteristics
80
70
V
IN
=55
V
75
70
V
IN
V
=55
Efficiency
η
(%)
Efficiency
η
(%)
60
60
70
V
40
V
24
Efficiency
η
(%)
48V
40V
30V
24V
50
40
30
50
65
40
60
I
O
2 = –50mA constant
0
0 50
100 150 200 250 300 350 400 450 500
30
I
O
2 = –100mA constant
0
0
50
100
150
200
250
300
350
400
20
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Output Current 1 l
O
1 (A)
Output Current 1 l
O
1 (A)
Output Current l
O
(A)
SI-8922L
Rise Characteristics
8
7
Output Voltage V
O
(V)
6
3
2
1
00
10
I
O
=0.4A
0.6A
4
0.5A
5
20
30
40
Input Voltage V
IN
(V)
Efficiency Characteristics
80
V
IN
=55
V
70
60
50
40
30
20
00
Efficiency
η
(%)
48V
40V
30V
24V
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
Output Current l
O
(A)
106
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