FD-Family
Switching Regulators, PCB + Chassis
Benign Environment
TOKO Switching Regulators
No input to output isolation
Single output of 3.3, 5, 12, 15 or 30 V DC/0.5...1.5 W
Double output of
±
12 or
±
15 V DC/0.5...3 W
Input voltage from 4.5 V up to 17 V DC
•
Miniature size
•
Surface mounting type
•
High power density
•
•
•
•
4.3
High efficiency
Excellent line/load regulation
Parallel operation
Inhibit function available
FD-Family
new
Page
•
High reliability
Table of Contents
Type Survey .............................................................. 4 - 84
Description ................................................................ 4 - 85
Safety and Installation Instructions ........................... 4 - 85
Electrical Input and Output Data ............................... 4 - 86
Immunity to Environmental Conditions ...................... 4 - 88
Mechanical Data ....................................................... 4 - 88
Type Key and Product Marking ................................. 4 - 89
Type Survey
Table 1a: Survey of step-down type FDD
Nominal
output
voltage
U
o nom
3.3 V
Nominal
output
current
I
o
120...600 mA
Input
voltage
range
U
i
5...12 V
6...17 V
5V
Nominal
input
voltage
U
i nom
8V
12 V
Efficiency
(typ)
η
84%
82%
87%
Type
designation
(Master or Slave)
FDD 1106
FDD 1206
FDD 1203
3W
Rated
output
power
P
o max
2W
Table 1b: Survey of flyback type FDB and FDF
Nominal
output
voltage
U
o nom
5V
12 V
Nominal
output
current
I
o
100...250 mA
45...115 mA
70...125 mA
15 V
40...90 mA
70...100 mA
30 V
±12
V
±15
V
10...30 mA
±22.5...±57.5
mA
±35...±62.5
mA
±20...±45
mA
±35...±50
mA
Input
voltage
range
U
i
5...12 V
4.5...5.5 V
9...17 V
4.5...5.5 V
9...17 V
5...12 V
6...17 V
4.5...5.5 V
9...17 V
4.5...5.5 V
9...17 V
Nominal
input
voltage
U
i nom
8V
5V
12 V
5V
12 V
8V
12V
5V
12 V
5V
12 V
Efficiency
(typ)
η
77 %
70 %
71%
70 %
71 %
79 %
80 %
72 %
73 %
72 %
72 %
Type
designation
(Master or Slave)
FDF 1103
FDB 1001
FDF 1301
FDB 1002
FDF 1302
FDF 1105
FDF 1205
FDB 2001
FDF 2301
FDB 2002
FDF 2302
1.4 W
1.5 W
1.35 W
1.5 W
Rated
output
power
P
o max
1.25 W
1.4 W
1.5 W
1.35 W
1.5 W
0.9 W
4 - 84
MELCHER
The Power Partners.
Edition 2/96 - © Melcher AG
Benign Environment
Description
Switching Regulators, PCB + Chassis
FD-Family
The FD-Family features very compact designed switching
regulators in a miniature size case for surface mount,
hence, these converters have an extremely high power
density. With a high efficiency of up to 87 %, very stable out-
put voltages as well as high reliability, the FD-family be-
comes a perfect choice for the supply of LCD's, non-volatile
memories, voltage distribution in 5 V logical circuits and
CCD applications. Furthermore, a special master-slave
connection allows safe parallel operation of two or more
units. For a wide variety of filtering circuits for smooth out-
put voltages, a full range of optional choke coils are avail-
able.
Safety and Installation Instructions
Safety for Step Down Types
If the output circuit of a switching regulator is operator-ac-
cessible according to the IEC 950 related safety standards,
it shall be an SELV circuit (Safety Extra Low Voltage circuit,
i.e. a circuit, separated from mains by at least basic insula-
tion, that is so designed and protected that under normal
and single fault conditions, the voltage between any two
conductors and between any conductor and earth does not
exceed DC 60 V).
In the following statement an interpretation is provided of
the IEC 950 safety standard with respect to the safety sta-
tus of the output circuit. However, it is the sole responsibility
of the installer or user to assure the compliance with the
relevant and applicable safety standards:
If the input circuit of a switching regulator is an SELV circuit,
it’s output is considered to be an SELV circuit.
Filtering Recommendations
Circuit design by means of adding input and output capaci-
tors in order to reduce ripple and noise to a moderate value.
Vi
SD
GND
1
6
Vo–
Vi
SD
GND
1
6
n.c.
GND
Safety for Step Up Types
If the output circuit of a switching regulator is operator-ac-
cessible according to the IEC 950 related safety standards,
it shall be an SELV circuit (Safety Extra Low Voltage circuit,
i.e. a circuit, separated from mains by at least basic insula-
tion, that is so designed and protected that under normal
and single fault conditions, the voltage between any two
conductors and between any conductor and earth does not
exceed DC 60 V).
In the following statement an interpretation is provided of
the IEC 950 safety standard with respect to the safety sta-
tus of the output circuit. However, it is the sole responsibility
of the installer or user to assure the compliance with the
relevant and applicable safety standards:
If the input circuit of a switching regulator is an SELV circuit
and the output is protected against overvoltages higher
than 60 V by external means, e.g. an overvoltage suppres-
sor diode, the output is considered to be an SELV circuit.
C
1
PDR
C
2
GND
C
1
C
2
PDR
Vo+
C
2
Vo+
Fig. 1
External circuitry for 2 output units
Table 2a: Recommended external capacitors
C
1
OS-CON
10
µF/20
V
in parallel
Al-Chip
33
µF/25
V
Fig. 2
External circuitry for 1 output step down units
Table 2b: Recommended external capacitors
C
2
SP Cap
22
µF/8
V
I
i ripple
(mA
rms
)
535
490
575
450
Type
FDD 1106
FDD 1206
FDD 1203
FDB 1001
FDB 1002
I
o ripple
(mA
rms
)
100
105
135
245
215
125
105
C
1
OS-CON
3.3
µF/20
V
in parallel
Al-Chip
33
µF/25
V
OS-CON
10
µF/20
V
in parallel
Al-Chip
33
µF/25
V
I
i ripple
(mA
rms
)
245
240
260
250
475
Type
FDF 1301
FDF 1302
FDF 2301
FDF 2302
FDF 1103
I
o ripple
(mA
rms
)
205
180
135
130
395
C
2
same as
C
1
same as
C
1
425
415
FDB 2001
FDB 2002
OS CON
3.3
µF/20
V
in parallel
Al-Chip
33
µF/25
V
SP Cap
22
µF/8
V
in parallel
Al-Chip
33
µF/25
V
Al-Chip
10
µF/50
V
2 in parallel
295
270
FDF 1105
FDF 1205
55
60
Remarks:
Smoothing capacitors should be connected within 15 mm
from the converter pins.
It is recommended to use low impedance smoothing ca-
pacitors with high frequency rating. Refer to the table above
for recommended external capacitors.
Edition 2/96 - © Melcher AG
MELCHER
The Power Partners.
4 - 85
4.3
FD-Family
Parallel Connection
Vi
SD
1
6
Switching Regulators, PCB + Chassis
Benign Environment
Vo–
GND
FDF 2301M
Master
Notes:
– For parallel operation the master parallel drive signal out-
put is connected to the slave parallel drive signal input.
– Up to 5 units can be operated in parallel.
– The converters should be placed close to each other.
Soldering Directions
Best results can be achieved with a soldering temperature
of 215
°C
for 10 seconds using a reflow soldering system
after a pre-heating period of 80 seconds at 135°C. The
switching regulator should not be exposed to the heat for
more than 30 seconds. Solder temperatures exceeding
240°C may damage the device.
1
6
GND
FDF 2301S
Slave
1
Drive signal
for parallel
operation
PDR
6
GND
Vo+
FDF 2301S
Slave
Fig. 3
Parallel connection
4.3
Electrical Input and Output Data
General Condition;
T
A
= 25°C
Table 3a: Input and output data FDD single channel
Characteristics
Output
Conditions
FDD 1106
min
typ
max
min
FDD 1206
typ
max
min
FDD 1203
typ
max
Unit
U
o
I
o nom
u
o
∆
U
o U
∆
U
o I
∆
U
o
/∆T
Input
Output voltage
Output current
Output ripple
Static line regulation
Static load regulation
Thermal coefficient
U
i min
…U
i max
U
i min
…U
i max
U
i min
,
I
o max
U
i min
...
U
i max
U
i nom,
I
o min
...
I
o max
U
i nom
,
I
o min
...I
o max
3.2
120
3.3
360
15
±1.5
±1
±0.5
3.4
600
3.2
120
3.3
360
15
±1.5
±1
±0.5
3.4
600
4.85
120
5.0
360
15
±1.5
±1
±0.5
5.15
600
V
mA
mV
pp
%
U
i
η
Input voltage
I
o min
...I
o max
5
8
12
6
12
17
6
12
17
V DC
Efficiency
Efficiency
U
i nom
,
I
o nom
84
82
87
%
Table 3b: Input and output data FDB single channel
Characteristics
Output
Conditions
FDB 1001
min
typ
max
FDB 1002
min
typ
max
Unit
U
o
I
o nom
u
o
∆
U
o U
∆
U
o I
∆
U
o
/∆T
Input
Output voltage
Output current
Output ripple
Static line regulation
Static load regulation
Thermal coefficient
U
i min
…U
i max
U
i min
…U
i max
U
i min
,
I
o max
U
i min
...
U
i max
U
i nom,
I
o min
...
I
o max
U
i nom
,
I
o min
...I
o max
11.64
45
12
80
58
±1.5
±1
±0.5
12.36
115
14.55
40
15
65
49
±1.5
±1
±0.5
15.45
90
V
mA
mV
pp
%
U
i
η
Input voltage
I
o min
...I
o max
U
i nom
,
I
o nom
4.5
5
5.5
4.5
5
5.5
V DC
Efficiency
Efficiency
77
79
%
4 - 86
MELCHER
The Power Partners.
Edition 2/96 - © Melcher AG
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