Datasheet

4
UC1525B UC1527B
UC2525B UC2527B
UC3525B UC3527B
ELECTRICAL CHARACTERISTICS:Unless otherwise stated, these specifications apply for T
A
= –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, T
A
=T
J
.
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) C
L
= 1nF, T
J
= 25°C 100 600 100 600 ns
Fall Time (Note 2) C
L
= 1nF, T
J
= 25°C 50 300 50 300 ns
Cross conduction charge Per cycle, T
J
= 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 (R
T
= 3.6KW,C
T
= 0.01mF, R
D
=0W). Approximate oscillator frequency is defined by:
()
f
CRR
TTD
=
••+
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