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PDF LTM8057 Data sheet ( Hoja de datos )
| Número de pieza | LTM8057 | |
| Descripción | uModule DC/DC Converter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTM8057 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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LTM8057
3.1VIN to 31VIN Isolated
µModule DC/DC Converter
FEATURES
DESCRIPTION
n 2kV AC Isolated µModule Converter (Tested at 3kVDC)
n UL60950 Recognized File 464570
n Wide Input Voltage Range: 3.1V to 31V
n Up to 440mA Output Current (VIN = 24V, VOUT1 = 2.5V)
Output Adjustable from 2.5V to 12V
n Current Mode Control
n Programmable Soft-Start
n User Configurable Undervoltage Lockout
n Low Profile (9mm × 11.25mm × 4.92mm)
BGA Package
APPLICATIONS
n Industrial Sensors
n Industrial Switches
n Test and Measurement Equipment
The LTM®8057 is a 2kV AC isolated flyback µModule®
(micromodule) DC/DC converter. Included in the package
are the switching controller, power switches, transformer,
and all support components. Operating over an input volt-
age range of 3.1V to 31V, the LTM8057 supports an output
voltage range of 2.5V to 12V, set by a single resistor. Only
output and input capacitors are needed to finish the design.
Other components may be used to control the soft-start
control and biasing.
The LTM8057 is packaged in a thermally enhanced, com-
pact (9mm × 11.25mm × 4.92mm) overmolded ball grid
array (BGA) package suitable for automated assembly
by standard surface mount equipment. The LTM8057 is
available with SnPb or RoHS compliant terminal finish.
L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
2kV AC Isolated µModule Regulator
VIN
4.3V TO 29V
VIN
•
VOUT
VOUT
5V
2.2µF
RUN
GND
•
VOUT–
22µF
4.7µF
6.98k
BIAS
SS
ADJ
LTM8057
8057 TA01a
2kV AC ISOLATION
Maximum Output Current vs VIN
400
300
200
100
0
0 5 10 15 20 25 30
VIN (V)
8057 TA01b
For more information www.linear.com/LTM8057
8057f
1
1 page  
LTM8057
T YPICAL PERFORMANCE CHARACTERISTICS Unless otherwise noted, operating conditions are
as in Table 1 (TA = 25°C).
Input Current vs Output Current
180 VOUT = 8V
160 BIAS = 5V
140
120 12VIN
100 24VIN
80
60
40
20
0
0 50 100 150 200 250 300
OUTPUT CURRENT (mA)
8057 G09
Bias Current vs Output Current
10
9
VOUT = 3.3V
BIAS = 5V
8 12VIN
7 24VIN
6
5
4
3
2
1
0
0 100 200 300 400
OUTPUT CURRENT (mA)
8057 G12
Input Current vs Output Current
200
180
VOUT = 12V
BIAS = 5V
160
140
120
12VIN
100 24VIN
80
60
40
20
0
0 50 100 150 200
OUTPUT CURRENT (mA)
8057 G10
Bias Current vs Output Current
12 VOUT = 5V
BIAS = 5V
10
12VIN
8
24VIN
6
4
2
0
0 100 200 300 400
OUTPUT CURRENT (mA)
8057 G13
Bias Current vs Output Current
9 VOUT = 2.5V
8 BIAS = 5V
7
12VIN
6
24VIN
5
4
3
2
1
0
1 100 200 300 400
OUTPUT CURRENT (mA)
8057 G11
Bias Current vs Output Current
12 VOUT = 8V
BIAS = 5V
10
12VIN
24VIN
8
6
4
2
0
0 50 100 150 200 250 300
OUTPUT CURRENT (mA)
8057 G14
Bias Current vs Output Current
14 VOUT = 12V
12 BIAS = 5V
10 12VIN
24VIN
8
6
4
2
0
0 50 100 150 200
OUTPUT CURRENT (mA)
8057 G15
Maximum Output Current vs VIN
500
BIAS = 5V FOR VIN ≥ 5V
BIAS = VIN FOR VIN < 5V
400
300
200
100
0
0
VOUT = 2.5V
VOUT = 3.3V
VOUT = 5V
5 10 15 20 25 30
VIN (V)
8057 G16
For more information www.linear.com/LTM8057
8057f
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5 Page 
APPLICATIONS INFORMATION
BIAS Pin Considerations
The BIAS pin is the output of an internal linear regulator
that powers the LTM8057’s internal circuitry. It is set to
3V and must be decoupled with a low ESR capacitor of at
least 4.7μF. The LTM8057 will run properly without applying
a voltage to this pin, but will operate more efficiently and
dissipate less power if a voltage between 3.1V and VIN is
applied. At low VIN, the LTM8057 will be able to deliver
more output current if BIAS is 3.1V or greater. Up to 31V
may be applied to this pin, but a high BIAS voltage will
cause excessive power dissipation in the internal circuitry.
For applications with an input voltage less than 15V, the
BIAS pin is typically connected directly to the VIN pin. For
input voltages greater than 15V, it is preferred to leave the
BIAS pin separate from the VIN pin, either powered from
a separate voltage source or left running from the internal
regulator. This has the added advantage of keeping the
physical size of the BIAS capacitor small. Do not allow
BIAS to rise above VIN.
Soft-Start
For many applications, it is necessary to minimize the
inrush current at start-up. The built-in soft-start circuit
significantly reduces the start-up current spike and output
voltage overshoot by applying a capacitor from SS to GND.
When the LTM8057 is enabled, whether from VIN reaching
a sufficiently high voltage or RUN being pulled high, the
LTM8057 will source approximately 10µA out of the SS
pin. As this current gradually charges the capacitor from
SS to GND, the LTM8057 will correspondingly increase
the power delivered to the output, allowing for a graceful
turn-on ramp.
Isolation, Working Voltage and Safety Compliance
The LTM8057 isolation is 100% hi-pot tested by tying all of
the primary pins together, all of the secondary pins together
and subjecting the two resultant circuits to a differential
of 3kV DC for one second. This establishes the isolation
voltage rating of the LTM8057 component.
LTM8057
The isolation rating of the LTM8057 is not the same as
the working or operational voltage that the application
will experience. This is subject to the application’s power
source, operating conditions, the industry where the end
product is used and other factors that dictate design re-
quirements such as the gap between copper planes, traces
and component pins on the printed circuit board, as well
as the type of connector that may be used. To maximize
the allowable working voltage, the LTM8057 has two
columns of solder balls removed to facilitate the printed
circuit board design. The ball to ball pitch is 1.27mm, and
the typical ball diameter is 0.78mm. Accounting for the
missing columns and the ball diameter, the printed circuit
board may be designed for a metal-to-metal separation of
up to 3.03mm. This may have to be reduced somewhat to
allow for tolerances in solder mask or other printed circuit
board design rules. For those situations where informa-
tion about the spacing of LTM8057 internal circuitry is
required, the minimum metal to metal separation of the
primary and secondary is 0.75mm.
To reiterate, the manufacturer’s isolation voltage rating
and the required working or operational voltage are often
different numbers. In the case of the LTM8057, the isola-
tion voltage rating is established by 100% hi-pot testing.
The working or operational voltage is a function of the
end product and its system level specifications. The ac-
tual required operational voltage is often smaller than the
manufacturer’s isolation rating.
The LTM8057 is a UL recognized component under
UL 60950, file number 464570. The UL 60950 insula-
tion category of the LTM8057 transformer is Functional.
Considering UL 60950 Table 2N and the gap distances
stated above, 3.03mm external and 0.75mm internal,
the LTM8057 may be operated with up to 250V working
voltage in a pollution degree 2 environment. The actual
working voltage, insulation category, pollution degree and
other critical parameters for the specific end application
depend upon the actual environmental, application and
safety compliance requirements. It is therefore up to the
user to perform a safety and compliance review to ensure
that the LTM8057 is suitable for the intended application.
For more information www.linear.com/LTM8057
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11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTM8057.PDF ] | |
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