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UC2849DW Fiches technique(PDF) 4 Page - Texas Instruments

No de pièce UC2849DW
Description  SECONDARY SIDE AVERAGE CURRENT MODE CONTROLLER
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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UC2849DW Fiches technique(HTML) 4 Page - Texas Instruments

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UC2849
UC3849
SLUS360C – JULY 1995 – REVISED AUGUST 2007
ELECTRICAL CHARACTERISTICS (continued)
Unless otherwise stated these specifications apply for TA = –40°C to 85°C for UC2849; and 0°C to 70°C for UC3849; VCC =
12 V, VEE = GND, Output no load, CT = 345 pF, RT = 4530Ω, RDEAD = 511Ω, RCLKSYN = 1 kΩ, TA = TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
2X Amplifier and Share Amplifier
V offset (b; y = mx + b)
20
mV
GAIN (m; y = mx + b)
Slope with AVOUT = 1 V and 2 V
1.98
2.02
V
GBW(2)
100
kHz
RSHARE
VCC = 0, VSHARE/ISHARE
200
k
Negative supply is VEE, GND Open,
Total offset
–75
0
75
mV
VAO = GND
VOL
VAO = voltage amplifier Vol, volts above VEE
0.05
0.45
0.6
IO = 0 mA, ILIM = 3 V, VAO = voltage amp VOH
5.7
6
6.3
V
VOH
IO = –1mA, ILIM = 3 V, VAO = voltage amp VOH
5.7
6
6.3
Adjust Amplifier
VIO
40
60
80
mV
gm
IOUT= –10 μA to 10 μA, VOUT = 3.5 V, CADJ = 1 μF
–1
mS
IOUT = 0
0.9
1
1.1
VOL
IOUT = 50 μA
0.85
1
1.15
V
IOUT = 0 , VSHARE = 6.5 V
5.7
6
6.3
VOH
IOUT = –50 μA, VSHARE = 6.5 V
5.7
6
6.3
Oscillator
Frequency
450
500
550
kHz
Max duty cycle
80%
85%
90%
OSC range amplitude
2
2.5
2.8
V
Clock Driver/SYNC (CLKSYN)
VOL
0.02
0.2
3.6
V
VOH
RCLKSYN = 200 Ω
3.2
ISOURCE
25
mA
RCLKSYN
VCC = 0, VCLKSYN/ICLKSYN
10
k
VTH
1.5
V
VREF Comparator
Turn-on threshold
4.72
V
Hysteresis
0.4
4
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