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PDF LT8312 Data sheet ( Hoja de datos )
| Número de pieza | LT8312 | |
| Descripción | Boost Controller | |
| Fabricantes | Linear | |
| Logotipo |  |
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LT8312
Boost Controller with
Power Factor Correction
Features
nn PFC Boost with Minimum Number of External Com-
ponents
nn VIN and VOUT Limited Only by External Components
nn Active Power Factor Correction
nn Low Harmonic Distortion
nn Overvoltage Protection
nn Energy Star Compliant (<0.5W No-Load Operation)
nn 16-Lead MSOP Package
Applications
nn Industrial
nn Aviation
Description
The LT®8312 is a power factor correction (PFC) boost
controller. A LT8312-based design can achieve a power
factor of greater than 0.99 by actively modulating the input
current, allowing compliance with most Harmonic Current
Emission requirements.
The LT8312 is well suited for a wide variety of off-line
applications. The input range can be scaled up or down,
depending mainly on the choice of external components.
Efficiencies higher than 95% can be achieved with output
power levels up to 250W.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical Application
90V
TO 265V
AC
Universal Input 200W PFC Boost Converter
B1
GBU404
0.1µF 499k 100k
499k 100k
D3
D2 20Ω
10µF
• 4:1
•
4.7pF
2k
1M
95.3k
100k
221k
VIN
VIN_SENSE
EN/UVLO
DCM
FB
LT8312
20Ω
GATE
VREF
OVP
SENSE
INTVCC
VC GND
4.7µF
2.2µF
D4
CMR5H-06
VOUT
400V
560µF 0.5A
×2
1M
1M
9.53k
0.01Ω
99
98
97
96
95
94
93
92
91
0
8312 TA01a
Efficiency
115VAC
230VAC 50Hz
20 40 60 80 100 120 140 160
POWER (W)
8312 G01
For more information www.linear.com/LT8312
8312fa
1
1 page  
Typical Performance Characteristics
LT8312
vMsaTxeimmupmeraVtIuNreShunt Current
10
9
8
7
6
5
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
8312 G10
THD vs Output Power
60
50
40
30
230VAC 50Hz
20
10
0
0
115VAC
20 40 60 80 100 120 140 160
POWER (W)
8312 G11
Power Factor vs Output Power
1.00
0.95 115VAC
0.90
230VAC 50Hz
0.85
0.80
0.75
0.70
0.65
0.60
0
20 40 60 80 100 120 140 160
POWER (W)
8312 G12
Pin Functions
GND (Pins 1, 2, 3, 7, 8): Ground.
VREF (Pin 4): Voltage Reference Output Pin, Typically
2V. This pin drives a resistor divider for the OVP pin. Can
supply up to 200μA.
OVP (Pin 5): Overvoltage Protection. This pin accepts a
DC voltage to compare to the voltage output information.
When FB pin voltage is above the OVP, the part stops
switching. This protects devices connected to the output.
VC (Pin 6): Compensation Pin for Internal Error Amplifier.
Connect a series RC from this pin to ground to compen-
sate the switching regulator. A 100pF capacitor in parallel
helps eliminate noise.
FB (Pin 9): Voltage Loop Feedback Pin. FB is used to
regulate the output voltage.
DCM (Pin 10): Discontinuous Conduction Mode Detection
Pin. Connect a capacitor and resistor in series with this
pin to the auxiliary winding.
VIN (Pin 11): Input Voltage. This pin supplies current to
the internal start-up circuitry and to the INTVCC LDO. This
pin must be locally bypassed with a capacitor. A 42V shunt
regulator is internally connected to this pin.
EN/UVLO (Pin 12): Enable/Undervoltage Lockout. A resis-
tor divider connected to VIN is tied to this pin to program
the minimum input voltage at which the LT8312 will turn
on. When below 1.25V, the part will draw 60μA with most
of the internal circuitry disabled and a 10μA hysteresis
current will be pulled out of the EN/UVLO pin. When above
1.25V, the part will be enabled and begin to switch and
the 10μA hysteresis current is turned off.
INTVCC (Pin 13): Regulated Supply for Internal Loads
and GATE Driver. Supplied from VIN and regulates to 10V
(typical). INTVCC must be bypassed with a 4.7μF capacitor
placed close to the pin.
GATE (Pin 14): N-Channel FET Gate Driver Output. Switches
between INTVCC and GND. Driven to GND during shutdown
state and stays high during low voltage states.
SENSE (Pin 15): The Current Sense Input for the Control
Loop. Kelvin connect this pin to the positive terminal of the
switch current sense resistor, RSENSE, in the source of the
NFET. The negative terminal of the current sense resistor
should be connected to the GND plane close to the IC.
VIN(SENSE) (Pin 16): Line Voltage Sense Pin. The pin is
used for sensing the AC line voltage to perform power
factor correction. Connect a resistor in series with the
line voltage to this pin.
For more information www.linear.com/LT8312
8312fa
5
5 Page 
Typical Applications
LT8312
For more information www.linear.com/LT8312
8312fa
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LT8312.PDF ] | |
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