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PDF LTM8046 Data sheet ( Hoja de datos )
| Número de pieza | LTM8046 | |
| Descripción | 2kVAC Isolated DC/DC uModule Converter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTM8046
3.1VIN to 31VIN, 2kVAC
Isolated DC/DC µModule
Converter
Features
n 2kVAC Isolated µModule Converter (Tested to 3kVDC)
n UL 60950 Recognized ® , File E464570
n Wide Input Voltage Range: 3.1V to 31V
n 5V at 550mA from 24VIN
n 1.8V to 12V Output Voltage
n Current Mode Control
n Programmable Soft-Start
n User Configurable Undervoltage Lockout
n SnPb or RoHS Compliant Finish
n 9mm × 15mm × 4.92mm BGA Package
Applications
n Industrial Sensors
n Industrial Switches
n Ground Loop Mitigation
Description
The LTM®8046 is an isolated flyback DC/DC µModule®
(micromodule) converter. The LTM8046 has an isolation
rating of 2kVAC. Included in the package are the switching
controller, power switches, transformer, and all support
components. Operating over an input voltage range of 3.1V
to 31V, the LTM8046 supports an output voltage range
of 1.8V to 12V, set by one resistor. Only output, input,
and bias capacitors are needed to finish the design. An
optional capacitor can be used to set the soft-start period.
The LTM8046 is packaged in a 9mm × 15mm × 4.92mm
over-molded ball grid array (BGA) package suitable for
automated assembly by standard surface mount equip-
ment. The LTM8046 is available with SnPb (BGA) 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 Isolated Low Noise µModule Regulator
VIN
4.3V TO 26V
1µF
1µF 8.45k
VIN
RUN
BIAS
LTM8046
VOUT
FB
SS
GND
VOUT–
2kVAC ISOLATION
VOUT
5V
100µF
8046 TA01a
Maximum Output Current vs VIN
700
600
500
400
300
200
100
0
5 10 15 20 25 30
VIN (V)
8046 TA01b
For more information www.linear.com/LTM8046
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1 page  
Typical Performance Characteristics
LTM8046
C5VurOrUeTnItnput Current vs Output
350 BIAS = 3.3V
300 5VIN
250
12VIN
200
150
24VIN
100
50
0
0 200 400 800
OUTPUT CURRENT (mA)
8046 G10
C1.u8rVreOnUtT Bias Current vs Output
11 BIAS = 3.3V
10
5VIN
9 12VIN
8
24VIN
7
6
5
4
0 200 400 600 800
OUTPUT CURRENT (mA)
8046 G13
5VOUT Bias Current vs Output
Current
14 BIAS = 3.3V
5VIN
12
12VIN
10 24VIN
8
6
4
2
0
0 200 400 600
OUTPUT CURRENT (mA)
8046 G16
C8VurOrUeTnItnput Current vs Output
400
BIAS = 3.3V
350
5VIN
300
12VIN
250
200
20VIN
150
100
50
0
0 100 200 300 400 500
OUTPUT CURRENT (mA)
8046 G11
C2.u5rVreOnUtT Bias Current vs Output
14 BIAS = 3.3V
12 5VIN
10 12VIN
8
24VIN
6
4
2
0
0 200 400 600 800
OUTPUT CURRENT (mA)
8046 G14
8VOUT Bias Current vs Output
Current
16 BIAS = 3.3V
15
14
5VIN
13 12VIN
12
11
10
20VIN
9
8
7
6
0 100 200 300 400 500
OUTPUT CURRENT (mA)
8046 G17
For more information www.linear.com/LTM8046
C12uVrrOeUnTt Input Current vs Output
400 BIAS = 3.3V
350 5VIN
300
12VIN
250
200
150
100
50
0
0 50 100 150 200 250
OUTPUT CURRENT (mA)
8046 12
3C.u3rVreOnUtT Bias Current vs Output
13
12 5VIN
BIAS = 3.3V
11
10 12VIN
9
24VIN
8
7
6
5
4
0 100 200 300 400 500 600 700
OUTPUT CURRENT (mA)
8046 G15
12VOUT Bias Current vs Output
Current
16 BIAS = 3.3V
15
5VIN
14
13
12 12VIN
11
10
9
8
7
6
0 50 100 150 200 250
OUTPUT CURRENT (mA)
8046 G18
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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 LTM8046’s internal circuitry. It is set to
3V and must be decoupled with a low ESR capacitor of at
least 1μF. The LTM8046 will run properly without apply-
ing a voltage to this pin, but will operate more efficiently
and dissipate less power if a voltage greater than 3.1V is
applied. At low VIN, the LTM8046 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 out-
put voltage overshoot by applying a capacitor from SS to
GND. When the LTM8046 is enabled, whether from VIN
reaching a sufficiently high voltage or RUN being pulled
high, the LTM8046 will source approximately 8µA out of
the SS pin. As this current gradually charges the capaci-
tor from SS to GND, the LTM8046 will correspondingly
increase the power delivered to the output, allowing for a
graceful turn-on ramp.
Isolation Working Voltage and Safety
The LTM8046 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 3kVDC for one second. This establishes
the isolation voltage rating of the LTM8046 component.
LTM8046
The isolation rating of the LTM8046 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
requirements 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 LTM8046 has
three rows 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 row and the ball diameter, the printed circuit
board may be designed for a metal-to-metal separation
of up to 4.3mm. This may have to be reduced somewhat
to allow for tolerances in solder mask or other printed
circuit board design rules.
To reiterate, the manufacturer’s isolation voltage rating
and the required operational voltage are often different
numbers. In the case of the LTM8046, the isolation 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 actual required
operational voltage is often smaller than the manufacturer’s
isolation rating.
For those situations where information about the spacing
of LTM8046 internal circuitry is required, the minimum
metal to metal separation of the primary and secondary is
1.9mm. The LTM8046 isa UL recognized component under
UL 60950-1, file number E464570. The UL 60950-1 insula-
tion category of the LTM8046 transformer is Functional.
Considering UL 60950-1 Table 2N and the gap distances
stated above, 4.3mm external and 1.9mm internal, the
LTM8046 may be operated with up to 400V 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 LTM8046 is suitable for the intended application.
For more information www.linear.com/LTM8046
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11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTM8046.PDF ] | |
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