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UC2902 Fiches technique(PDF) 3 Page - Texas Instruments

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No de pièce UC2902
Description  Load Share Controller
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

UC2902 Fiches technique(HTML) 3 Page - Texas Instruments

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3
UC1902
UC2902
UC3902
ELECTRICAL CHARACTERISTICS: Unless otherwise specified, TA = –55°C to +125°C for UC1902, –40°C to+85°C for
UC2902, 0°C to 70°C for UC3902, VCC = 5V, RADJR = 1kΩ, VADJ = 5V, COMP = 5nF capacitor to GND, VSHARE– = 0V, TA = TJ.
PARAMETERS
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Share Sense Amplifier
Input Impedance
SHARE+ = 1V, SHARE– = 1V, SENSE = +10mV
10
15
k
200
Ω resistor SHARE+ to GND, SHARE– = 1V, SENSE =
+10mV
15
17
k
Threshold
SENSE = 0V
41
70
100
mV
CMRR SHARE
0
≤ SHARE– ≤ 1V, SENSE = –2.5mV
50
60
dB
AVOL from SHARE+ to ADJR
SENSE = –2.5mV, 5nF capacitor COMP to GND, 1k resistor
ADJR to GND
50
68
dB
SENSE = –2.5mV, 5nF capacitor COMP to GND, 150
resistor ADJR to GND
50
66
dB
Slew Rate
SHARE+ = Step of 0mV to 300mV through a 200
Ω resistor,
RCOMP = 500
Ω resistor to 1.5V, SENSE = 10mV
0.4
0.7
1
V/
µs
Error Amplifier Section
Transconductance, SHARE+
to COMP
200
Ω resistor SHARE+ to GND
3.2
4.5
5.5
mS
IOH
COMP = 1.5V, SHARE+
≥ +300mV, SENSE = +10mV
–400
–325
–230
µA
IOL
200
Ω resistor SHARE+ to GND, COMP = 1.5V, SENSE =
+10mV
100
150
200
µA
Input Offset Voltage
15
35
65
mV
∆ VIO/∆ VSENSE
1k Resistor, ADJR to GND, –2.5mV < SENSE < –25mV
–6
0
6
mV/V
ADJ Amplifier
ADJR Low Voltage
SENSE = +10mV, 200
Ω resistor SHARE+ to GND
–1
0
1
mV
ADJR High Voltage
SENSE = +10mV, SHARE+ = 1V
1.4
1.8
2.1
V
Current Gain ADJR to ADJ
ADJR Current = –0.5mA, ADJ = 2.5V, SENSE = +10mV,
SHARE+ = 1V
0.96
0.99
1
A/A
ADJR Current = –0.5mA, ADJ = 20V, SENSE = +10mV,
SHARE+ = 1V
0.96
0.99
1
A/A
ADJR Current = –10mA, ADJ = 2.5V, SENSE = +10mV,
SHARE+ = 1V
0.96
0.99
1
A/A
ADJR Current = –10mA, ADJ = 20V, SENSE = +10mV,
SHARE+ = 1V
0.96
0.99
1
A/A
ADJ: Current output of adjust amplifier circuit (NPN
collector).
ADJR: Current adjust amplifier range set (NPN emitter).
COMP: Output of error amplifier, input of adjust amplifier.
This is where the compensation capacitor is connected.
GND: Local power supply return and signal ground.
SENSE: Inverting input of current sense amplifier.
SHARE+: Positive input from share bus or drive to share
bus.
SHARE-: Reference for SHARE+.
VCC: Local power supply (positive).
PIN DESCRIPTIONS


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