ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage (+V
IN
). . . . . . . . . . . . . . . . . . . . . . . . . . . . . +40V
Open Collector Output Voltages. . . . . . . . . . . . . . . . . . . . . +40V
Open Collector Output Currents . . . . . . . . . . . . . . . . . . . . 50mA
Sense 1-4 Input Voltages . . . . . . . . . . . . . . . . . . . -0.3V to +20V
Line/Switcher Sense Input Voltage . . . . . . . . . . . -0.3V to +40V
Op-Amp and Inverter Input Voltages . . . . . . . . . . -0.3V to +40V
Op-Amp and Inverter Output Currents . . . . . . . . . . . . . . -40mA
Window Adjust Voltage. . . . . . . . . . . . . . . . . . . . . 0.0V to +10V
Delay Pin Voltages . . . . . . . . . . . . . . . . . . . . . . . . . 0.0V to +5V
Reference Output Current . . . . . . . . . . . . . . . . . . . . . . . -40mA
Power Dissipation at T
A
= 25°C (Note 1) . . . . . . . . . . . 1000mW
Power Dissipation at T
C
= 25°C (Note 1) . . . . . . . . . . . 2000mW
Operating Junction Temperature . . . . . . . . . . . -55°C to +150°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300°C
UC1903
UC2903
UC3903
Note 1: Voltages are referenced to ground (Pin 3). Currents
are positive into, negative out of, the specified terminals.
Consult Packaging Section of Databook for thermal
limitations and considerations of package.
CONNECTION DIAGRAMS
PLCC-20, LCC-20
(TOP VIEW)
Q, L Package
PACKAGE PIN FUNCTION
FUNCTION
PIN
DIL-18, SOIC-18 (TOP VIEW)
J or N, DW Package
+VIN
V
REF
(2.5V)
GROUND
GROUND
WINDOW ADJUST
N/C
SENSE 4 INVERT
INPUT
SENSE 4
SENSE 3
SENSE 2
SENSE 1
OV DELAY
OV FAULT
UV FAULT
UV DELAY
POWER OK
LINE/SWITCHER
SENSE
G.P. OP-AMP OUT
G.P. OP-AMP N.I.
G.P. OP-AMP INV.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, these specifications apply for T
A
= –55°C to +125°C for the
UC1903; –40°C to +85°C for the UC2903; and 0°C to +70°C for the UC3903; +V
IN
=
15V; Sense Inputs (Pins 6–9 and Pin 15) = 2.5V; V
PIN 4
= 1.0V, T
A
= T
J.
PARAMETERS
Supply
Input Supply Current
Supply Under Voltage
Threshold (V
SUV
)
Minimum Supply to Enable
Power OK Output
Reference
Output Voltage (V
REF
)
Load Regulation
Line Regulation
Short Circuit Current
Fault Thresholds
(Note 4)
OV Threshold Adj.
UV Threshold Adj.
Offset from V
REF
as a function of V
PIN 4
Input = Low to High, 0.5V
≤
V
PIN 4
≤
2.5V
Offset from V
REF
as a function of V
PIN 4
Input = High to Low, 0.5V
≤
V
PIN 4
≤
2.5V
.230
-.270
.25
-.25
.270
-.230
.230
-.270
.25
-.25
.270
-.230
V/V
V/V
T
J
= 25°C
Over Temperature
I
L
= 0 to 10mA
+V
IN
= 8 to 40V
T
J
= 25°C
2.485
2.465
1
1
40
2.5
2.515
2.535
10
4
2.470
2.465
1
1
40
2.5
2.530
2.535
15
8
V
V
mV
mV
mA
No Faults
UV, OV and Line Fault
Fault Outputs Enabled
6.0
7
10
7.0
3.0
9
15
7.5
4.0
5.5
7
10
7.0
3.0
11
18
8.0
4.0
mA
mA
V
V
TEST CONDITIONS
UC1903 / UC2903
MIN
TYP
MAX
MIN
UC3903
TYP
MAX
UNITS
Powered by ICminer.com Electronic-Library Service CopyRight 2003
2
ETC [ ETC ]
