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UC2849 Scheda tecnica(PDF) 3 Page - Texas Instruments

Il numero della parte UC2849
Spiegazioni elettronici  Secondary Side Average Current Mode Controller
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

UC2849 Scheda tecnica(HTML) 3 Page - Texas Instruments

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PARAMETER
TEST CONDITION
MIN
TYP
MAX
UNITS
Current Error Amplifier (cont.)
Avo
60
90
dB
GBW (Note 2)
Acl = 1, RIN = 1k, CC=15pF, f=200kHz (Note 1)
4.5
7
MHz
Vol
IO = 1mA, Voltage above VEE
0.5
V
Voh
IO = 0mA
3.8
V
IO =
1mA
3.5
V
CMRR
−0.2 < Vcm < 8V
80
dB
PSRR
10V < VCC < 20V
80
dB
Voltage Error Amplifier
Ib
0.5
3
µA
Vio
25
mV
Avo
60
90
dB
GBW (Note 2)
f = 200kHz
4.5
7
MHz
Vol
IO = 175
µA, Volts above VEE
0.3
0.6
V
Voh
ILIM > 3V
2.85
3
3.15
V
Voh - ILIM
Tested ILIM = 0.5V, 1.0V, 2.0V
100
100
mV
CMRR
−0.2 < Vcm < 8V
80
dB
PSRR
10V < VCC < 20V
80
dB
2X Amplifier and Share Amplifier
V offset (b; y = mx + b)
20
mV
GAIN (m; y = mx + b)
Slope with AVOUT = 1V and 2V
1.98
2.02
V
GBW (Note 2)
100
kHZ
RSHARE
VCC = 0, VSHARE/ISHARE
200
k
Total Offset
Negative supply is VEE, GND Open, VAO = GND
75
0
75
mV
Vol
VAO = Voltage Amplifier Vol, Volts above VEE
0.2
0.45
0.6
V
Voh
IO = 0mA, ILIM = 3V, VAO = Voltage Amp Voh
5.7
6
6.3
V
IO =
1mA, ILIM = 3V, VAO = Voltage Amp Voh
5.7
6
6.3
V
Adjust Amplifier
Vio
40
60
80
mV
gm
IOUT=
10µA to 10µA, VOUT = 3.5V, CADJ = 1µF
1mS
Vol
IOUT = 0
0.9
1
1.1
V
IOUT = 50
µA
0.85
1
1.15
V
Voh
IOUT = 0, VSHARE = 6.5V
5.7
6
6.3
V
IOUT =
50µA, VSHARE = 6.5V
5.7
6
6.3
V
Oscillator
Frequency
450
500
550
kHz
Max Duty Cycle
80
85
90
%
OSC Ramp Amplitude
2
2.5
2.8
V
Clock Driver/SYNC (CLKSYN)
Vol
0.02
0.2
V
Voh
3.6
V
RCLKSYN = 200
3.2
V
ISOURCE
25
mA
RCLKSYN
VCC = 0, VCLKSYN/ICLKSYN
10
k
VTH
1.5
V
UC1849
UC2849
UC3849
ELECTRICAL CHARACTERISTICS Unless otherwise stated these specifications apply for TA =
55°Cto +125°C for
UC1849;
−40
°C to +85°C for UC2849; and 0°C to +70°C for UC3849;VCC = 12V, VEE = GND, Output no load, CT = 345pF, RT =
4530
Ω, RDEAD = 511Ω, RCLKSYN = 1k, TA = TJ.


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