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UC2856 Fiches technique(PDF) 2 Page - Texas Instruments

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No de pièce UC2856
Description  Improved Current Mode PWM Controller
Download  9 Pages
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

UC2856 Fiches technique(HTML) 2 Page - Texas Instruments

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UC1856
UC2856
UC3856
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ....................................................................
+40V
Collector Supply Voltage .....................................................
+40V
Output Current, Source or Sink
DC...................................................................................0.5A
Pulse (0.5
µs)...................................................................2.0A
Error Amp Inputs....................................................
−0.3V to +VIN
Shutdown Input.....................................................
−0.3V to +10V
Current Sense Inputs..............................................
−0.3V to +3V
SYNC Output Current ......................................................±10mA
Error Amplifier Output Current ...........................................
−5mA
Soft Start Sink Current.......................................................50mA
Oscillator Charging Current .................................................5mA
Power Dissipation at TA
= 25°C (Note 2).......................1000mW
Power Dissipation at TC
= 25°C (Note 2) ......................2000mW
Junction Temperature .......................................
−55°C to +150°C
Storage Temperature Range ............................
−65°C to +150°C
Lead Temperature (Soldering, 10 sec.) ...........................
+300°C
All voltages are with respect to Ground. Currents are positive
into, negative out of the specified terminal. Consult packaging
section of databook for thermal limitations and considerations of
package.
CONNECTION DIAGRAMS
DIL–16, SOIC-16 (Top View)
J or N, DW PACKAGE
PLCC-20 (Top View)
Q PACKAGE
PLCC-28 (Top View)
QP PACKAGE
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA
= −55°C to +125°C for
UC1856;
− 40°C to +85°C for the UC2856; and 0°C to +70°C for the UC3856, VIN
= 15V, RT = 10k, CT = 1nF, TA = TJ.
UC1856/UC2856
UC3856
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
Reference Section
Output Voltage
TJ
= 25°C, Io = 1mA
5.05
5.10
5.15
5.00
5.10
5.20
V
Line Regulation
VIN
= 8V to 40V
20
20
mV
Load Regulation
Io
=−1mA to −10mA
15
15
mV
Total Output Variation
Line, Load, and Temperature
5.00
5.20
4.95
5.25
V
Output Noise Voltage
10Hz < f < 10kHz, TJ
= 25°C
50
50
µV
Long Term Stability
TJ
= 125°C, 1000 Hrs (Note 2)
5
25
5
25
mV
Short Circuit Current
VREF
= 0V
−25
−45
−65
−25
−45
−65
mA
Oscillator Section
Initial Accuracy
TJ
= 25°C
180
200
220
180
200
220
kHz
Over Operating Range
170
230
170
230
kHz


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