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UC2851NG4 Fiches technique(PDF) 3 Page - Texas Instruments

No de pièce UC2851NG4
Description  Programmable, Off-Line, PWM Controller
Download  11 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

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ELECTRICAL CHARACTERISTICS:
PARAMETER
TEST CONDITIONS
UC1851 / UC2851
UC3851
UNITS
MIN
TYP
MAX
MIN
TYP
MAX
Ramp Generator
Ramp Current, Minimum
ISENSE =
−10µA
-11
-14
-11
-14
µA
Ramp Current, Maximum
ISENSE = 1.0mA
-0.9
-.95
-0.9
-.95
mA
Ramp Valley
0.3
0.4
0.6
0.3
0.4
0.6
V
Ramp Peak
Clamping Level
3.9
4.2
4.5
3.9
4.2
4.5
V
Error Amplifier
Input Offset Voltage
VCM = 5.0V
0.5
5
2
10
mV
Input Bias Current
0.5
2
1
5
µA
Input Offset Current
0.5
0.5
µA
Open Loop Gain
∆VO = 1 to 3V
60
66
60
66
dB
Output Swing (Max Output
Ramp Peak - 100mV)
Minimum Total Range
0.3
3.5
0.3
3.5
V
CMRR
VCM = 1.5 to 5.5V
70
80
70
80
dB
PSRR
VIN = 8 to 30V
70
80
70
80
dB
Short Circuit Current
VCOMP = 0V
-4
-10
-4
-10
mA
Gain Bandwidth (Note 1)
TJ = 25°C, AVOL = 0dB
1
2
1
2
MHz
Slew Rate (Note 1)
TJ = 25°C, AVCL = 0dB
0.8
0.8
V/
µs
PWM Section
Continuous Duty Cycle Range
(other than zero) (Note 1)
Minimum Total Continuous Range
Ramp Peak < 4.2V
246
2
46
%
Output High Level
ISOURCE = 20mA
18
18.5
18
18.5
V
ISOURCE = 200mA
17
18.5
17
18.5
V
Rise Time (Note 1)
TJ = 25°C, CL = 1nF
50
150
50
150
ns
Fall Time (Note 1)
TJ = 25°C, CL = 1nF
50
150
50
150
ns
Output Saturation
IOUT = 20mA
0.2
0.4
0.2
0.4
V
IOUT = 200mA
1.7
2.2
1.7
2.2
V
Comparator Delay (Note 1)
Pin 8 to Pin 12, TJ = 25°C, RL = 1k
300
500
300
500
ns
Sequencing Functions
Comparator Thresholds
Pins 2, 3, 5
2.8
3.0
3.2
2.8
3.0
3.2
V
Input Bias Current
Pins 3, 5 = 0V
-1.0
-4.0
-1.0
-4.0
µA
Input Leakage
Pins 3, 5 = 10V
0.1
2.0
0.1
2.0
µA
Start/UV Hysteresis Current
Pin 2 = 2.5V
170
200
220
170
200
230
µA
Ext. Stop Threshold
Pin 4
0.8
1.6
2.4
0.8
1.6
2.4
V
Error Latch Activate Current
Pin 4 = 0V, Pin 3 > 3V
-120
-200
-120
-200
µA
Driver Bias Saturation Voltage,
VIN-VOH
IB = -50mA
2
3
2
3
V
Driver Bias Leakage
VB = 0V
-0.1
-10
-0.1
-10
µA
Slow-Start Saturation
IS = 10mA
0.2
0.5
0.2
0.5
V
Slow-Start Leakage
VS = 4.5V
0.1
2.0
0.1
2.0
µA
Current Control
Current Limit Offset
0
5
0
10
mV
Current Shutdown Offset
370
400
430
360
400
440
mV
Input Bias Current
Pin 7 = 0V
-2
-5
-2
-5
µA
Common Mode Range (Note 1)
-0.4
3.0
-0.4
3.0
V
Current Limit Delay (Note 1)
TJ = 25°C, Pin 7 to 12, RL = 1k
200
400
200
400
ns
Note 1:Guaranteed by design. Not 100% tested in production.
UC1851
UC2851
UC3851
Unless otherwise stated, these specifications apply for TA = -55°C to +125°C for the
UC1851, -40°C to +85°C for the UC2851, and 0°C to 70°C for the UC3851; VIN =
20V, RT = 20k
Ω, CT = .001 mfd, RR = 10kΩ, CR = .001mfd. Current Limit Threshold
= 200mV, TA = TJ.
3


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