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UC2849DW Fiches technique(PDF) 3 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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ELECTRICAL CHARACTERISTICS
(1)
UC2849
UC3849
SLUS360C – JULY 1995 – REVISED AUGUST 2007
RECOMMENDED OPERATING CONDITIONS (continued)
MIN
MAX
UNIT
Timing resistor (RT)
1
200
k
Timing capacitor (CT)
75
2000
pF
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
Current Sense Amplifier
Ib
0.5
3
μA
TA = 25°C
3
VIO
mV
Over Temperature
5
Avo
60
90
dB
GBW (2)
Acl = 1, RIN = 1 kΩ, CC = 15 pF, f = 200 kHz
(3)
4.5
7
MHz
VOL
IO = 1 mA, voltage above VEE
0.5
IO = 0 mA
3.8
V
VOH
IO = –1 mA
3.5
CMRR
–0.2 < Vcm < 6.5 V
80
dB
PSRR
10 V < VCC < 20 V
80
Current Error Amplifier
Ib
0.5
3
μA
VIO
3
20
mV
Avo
60
90
dB
GBW(2)
Acl = 1, RIN = 1 kΩ, CC = 15 pF, f = 200 kHz
(3)
4.5
7
MHz
VOL
IO = 1 mA, voltage above VEE
0.5
IO = 0 mA
3.8
V
VOH
IO = –1 mA
3.5
CMRR
–0.1 < Vcm < 6.5 V
80
dB
PSRR
10 V < VCC < 20 V
80
Voltage Error Amplifier
Ib
0.5
3
μA
VIO
2
5
mV
Avo
60
90
dB
GBW(2)
f = 200 kHz
4.5
7
MHz
VOL
IO = 175 μA, voltage above VEE
0.3
0.6
V
VOH
ILIM > 3 V
2.85
3
3.15
VOH – ILIM
Tested ILIM = 0.5 V, 1.0 V, 2.0 V
–100
100
mV
CMRR
–0.1 < Vcm < 6.5 V
80
dB
PSRR
10 V < VCC < 20 V
80
(1)
Unless otherwise specified all voltages are with respect to GND. Currents are positive into, negative out of the specified terminal.
(2)
Ensured by design not 100% tested in production.
(3)
If a closed loop gain greater than 1 is used, the possible GBW will increase by a factor of ACL + 10; where ACL is the closed loop gain.
3
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