2
UC1872
UC2872
UC3872
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, these parameters apply for TJ = −55°C to +125°C for the
UC1872, –40°C to +85°C for the UC2872, −0°C to +70°C for the UC3872; VCC= 5V, VC = 15V, V
ENBL
= 5V, CT = 1nF, ZD = 1V.
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Reference Section
Output Voltage T
J = 25°C 2.963 3.000 3.037 V
Over Temperature 2.940 3.000 3.060 V
Line Regulation VCC = 4.75V to 18V 10 mV
Load Regulation I
O
= 0 to −5mA 10 mV
Oscillator Section
Free Running Frequency T
J
= 25°C 576878kHz
Maximum Synchronization Frequency T
J
= 25°C 160 200 240 kHz
Charge Current V
CT
= 1.5V 180 200 220 µA
Voltage Stability 2%
Temperature Stability 48%
Zero Detect Threshold 0.46 0.5 0.56 V
Error Amp Section
Input Voltage V
O
= 2V 1.445 1.475 1.505 V
Input Bias Current −0.4 −2 µA
Open Loop Gain V
O
= 0.5 to 3V 65 90 dB
Output High V
INV
= 1.3V 3.1 3.5 3.9 V
ABSOLUTE MAXIMUM RATINGS
Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 to +10V
VCC, VC Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +24V
ZD Input Current
High Impedance Source . . . . . . . . . . . . . . . . . . . . . . +10mA
ZD Input Voltage
Low Impedance Source . . . . . . . . . . . . . . . . . . . . . . . . +24V
Power Dissipation at T
A = 25°C . . . . . . . . . . . . . . . . . . . . . . 1W
Storage Temperature . . . . . . . . . . . . . . . . . . . −65°C to +150°C
Lead Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300°C
Note 1: Currents are positive into, negative out of the specified
terminal.
Note 2: Consult Packaging Section of Databook for thermal limi
-
tations and considerations of package.
DIL-14 (TOP VIEW)
N Package
PLCC-20 (Top View)
Q Package
CONNECTION DIAGRAMS
SOIC-16, SSOP-16 (TOP VIEW)
DW, M Package