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UC1826 Arkusz danych(PDF) 2 Page - Texas Instruments

Numer części UC1826
Szczegółowy opis  Secondary Side Average Current Mode Controller
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UC1826 Arkusz danych(HTML) 2 Page - Texas Instruments

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UC1826
UC2826
UC3826
PLCC-28 (Top View)
Q Packages
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V
Output Current Source or Sink . . . . . . . . . . . . . . . . . . . . . . 0.3A
Analog Input Voltages . . . . . . . . . . . . . . . . . . . . . . . –0.3V to 7V
ILIM, KILL, SEQ, ENBL, RUN, PWRSEN, PWROK –0.3V to 7V
CLKSYN Current Source . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
RUN Current Sink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
SEQ Current Sink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
RDEAD Current Sink . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
RAMP Current Sink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Share Bus Voltage (voltage with respect to GND) . . 0V to 6.2V
ADJ Voltage (voltage with respect to GND) . . . . . . 0.9V to 6.3V
VEE (voltage with respect to GND) . . . . . . . . . . . . . . . . . –1.5V
CONNECTION DIAGRAMS
ELECTRICAL CHARACTERISTICS: Unless otherwise stated these specifications apply for TA = –55°C to +125°C for
UC1826; –40°C to +85°C for UC2826; and 0°C to +70°C for UC3826; VCC = 12V, VEE = GND, Output no load, CT = 345pF,
RT = 4k , RDEAD = 1000 , CRAMP = 345pF, RRAMP = 35.2k ,RCLKSYN = 1k, TA =TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Current Error Amplifier
Ib
0.5
3
A
Vio
TA = +25°C
0.75
3
mV
Over Temperature
5
mV
Avo
60
90
dB
GBW (Note 2)
Acl = 10, RIN = 1k, CC = 15pF, f = 200kHz (Note 1)
45
70
MHz
Vol
IO = 1mA, Voltage above VEE
0.5
V
Voh
IO = 0mA
3.8
V
IO = –1mA
3.5
V
Voltage Error Amplifier
Ib
0.5
3
A
Vio
5mV
Avo
60
90
dB
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C
All voltages with respect to VEE except where noted; all cur-
rents are positive into, negative out of the specified terminal.
Consult Packaging Section of Databook for thermal limitations
and considerations of packages.
RECOMMENDED OPERATING CONDITIONS
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8V to 20V
Sink/Source Output Current . . . . . . . . . . . . . . . . . . . . . . 250mA
Timing Resistor RT . . . . . . . . . . . . . . . . . . . . . . . . . . 1k to 200k
Timing Capacitor CT . . . . . . . . . . . . . . . . . . . . . . . . 75pF to 2nF
DIL-24, SOIC-24 (Top View)
J or N, DW Packages


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