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UC2854B-EP Fiches technique(PDF) 4 Page - Texas Instruments

No de pièce UC2854B-EP
Description  UC2854B-EP Advanced High-Power Factor Preregulator
Download  36 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

UC2854B-EP Fiches technique(HTML) 4 Page - Texas Instruments

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1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND
PKLMT
CAO
ISENSE
MOUT
IAC
VAO
VRMS
GTDRV
VCC
CT
SS
RSET
VSENSE
ENA
VREF
UC2854B-EP
SGLS318A – NOVEMBER 2005 – REVISED NOVEMBER 2015
www.ti.com
6 Pin Configuration and Functions
DW Package
16-Pin SOIC
Top View
Pin Functions
PIN
I/O
DESCRIPTION
NAME
J/N/DW
Q/L
Output of the wide bandwidth current amplifier and one of the inputs to the PWM duty-cycle
CAO
3
4
O
comparator. The output signal generated by this amplifier commands the PWM to force the
correct input current. The output can swing from 0.1 V to 7.5 V.
CT
14
18
I
Capacitor from CT to GND sets the PWM oscillator frequency
A nominal voltage above 2.65 V on this pin allows the device to begin operating. Once
ENA
10
13
I
operating, the device shuts off if this pin goes below 2.15 V nominal.
All bypass and timing capacitors connected to GND should have leads as short and direct
GND
1
2
as possible. All voltages are measured with respect GND.
Output of the PWM is a 1.5-A peak totem-pole MOSFET gate driver on GTDRV. This output
is internally clamped to 15 V so that the device can be operated with VCC as high as 35 V.
GTDRV
16
20
O
Use a series gate resistor of at least 5
Ω to prevent interaction between the gate impedance
and the GTDRV output driver that might cause the GTDRV output to overshoot excessively.
Some overshoot of the GTDRV output is always expected when driving a capacitive load.
Current input to the multiplier, proportional to the instantaneous line voltage. This input to
the analog multiplier is a current. The multiplier is tailored for low distortion from this current
input (IAC) to MOUT, so this is the only multiplier input that should be used for sensing
IAC
6
8
I
instantaneous line voltage. The nominal voltage on ac is 6 V, so in addition to a resistor from
IAC to rectified 60 Hz, connect a resistor from IAC to VREF. If the resistor to VREF is one-
fourth of the value of the resistor to the rectifier, then the 6-V offset is cancelled, and the line
current has minimal cross-over distortion.
Switch current sensing input. This is the inverting input to the current amplifier. This input
and the non-inverting input MOUT remain functional down to and below GND. Care should
ISENSE
4
5
I
be taken to avoid taking these inputs below
−0.5 V, because they are protected with diodes
to GND.
Multiplier output and current sense plus. The output of the analog multiplier and the non-
inverting input of the current amplifier are connected together at MOUT. The cautions about
MOUT
5
7
I/O
taking ISENSE below
−0.5 V also apply to MOUT. As the multiplier output is a current, this
is a high-impedance input similar to ISENSE, so the current amplifier can be configured as a
differential amplifier to reject GND noise.
Peak limit. The threshold for PKLMT is 0 V. Connect this input to the negative voltage on the
PKLMT
2
3
I
current sense resistor. Use a resistor to REF to offset the negative current sense signal up
to GND.
Oscillator charging current and multiplier limit set. A resistor from RSET to ground programs
RSET
12
15
I
oscillator charging current. Multiplier output current does not exceed 3.75 V divided by the
resistor from RSET to ground.
Soft-start. SS remains at GND as long as the device is disabled or VCC is too low. SS pulls
up to over 8 V by an internal 14-mA current source when both VCC becomes valid and the
device is enabled. SS acts as the reference input to the voltage amplifier if SS is below
SS
13
17
I
VREF. With a large capacitor from SS to GND, the reference to the voltage regulating
amplifier rises slowly, and increase the PWM duty cycle slowly. In the event of a disable
command or a supply dropout, SS will quickly discharge to ground and disable the PWM.
VAO
7
9
I
Voltage amplifier input
4
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