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UC3525B датащи(PDF) 4 Page - Texas Instruments

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номер детали UC3525B
подробное описание детали  Regulating Pulse Width Modulators
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UC1525B UC1527B
UC2525B UC2527B
UC3525B UC3527B
ELECTRICAL CHARACTERISTICS:Unless otherwise stated, these specifications apply for TA = –55°C to +125°C for the
UC1525B and UC1527B; –40°C to +85°C for the UC2525B and UC2527B; 0°C to +70°C for the UC3525B and UC3527B; +VIN =
20V, TA =TJ.
PARAMETER
TEST CONDITIONS
UC1525B/UC2525B
UC1527B/UC2527B
UC3525B
UC3527B
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
Output Drivers (Each Output) (VC = 20V) (cont.)
Rise Time (Note 2)
CL = 1nF, TJ = 25°C
100
600
100
600
ns
Fall Time (Note 2)
CL = 1nF, TJ = 25°C
50
300
50
300
ns
Cross conduction charge
Per cycle, TJ = 25°C
30
30
nc
Total Standby Current
Supply Current
VIN = 35V
14
20
14
20
mA
Note 2: Ensured by design. Not 100% tested in production.
Note 3: Tested at fosc= 40kHz (RT = 3.6K
W,CT = 0.01mF, RD =0W). Approximate oscillator frequency is defined by:
()
f
CR
R
TT
D
=
••
+
1
07
3
.
UDG-95056
UDG-95057
PRINCIPLES OF OPERATION AND TYPICAL CHARACTERISTICS
UC1525B Output Circuit (1/2 Circuit Shown)
UC1525B Output Saturation Characteristics
For
single-ended
supplies,
the
driver
outputs
are
grounded. The VC terminal is switched to ground by the to-
tem-pole source transistors on alternate oscillator cycles.
In conventional push-pull bipolar designs, forward base
drive is controlled by R1-R3. Rapid turn-off times for the
power devices are achieved with speed-up capacitors C,
and C2.
UDG-95059
UDG-95058


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