Datasheet

2
UC1572
UC2572
UC3572
ABSOLUTE MAXIMUM RATINGS
VCC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35V
EAINV. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.6V to VCC
I
EAOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25mA
RAMP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 4V
CS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VCC
Iout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.7A to 0.7A
I
3VREF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -15mA
Storage Temperature . . . . . . . . . . . . . . . . . . . -65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . -65°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C
Currents are positive into, negative out of the specified
terminal. Consult Packaging Section of Databook for thermal
limitations and considerations of packages.
DIL-8, SOIC-8 (TOP VIEW)
D, N or J Packages
CONNECTION DIAGRAM
TEMPERATURE RANGE PACKAGE
UC1572 –55°C to +125°C J
UC2572 –40°C to +85°C D, N or J
UC3572 0°C to +70°C D or N
ORDERING INFORMATION
ELECTRICAL CHARACTERISTICS:
Unless otherwise specified, VCC = 5V, CT = 680pF, T
A
=T
J
.
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Reference Section
3VREF 2.94 3 3.06 V
Line Regulation VCC = 4.75 to 30V 1 10 mV
Load Regulation I
3VREF = 0V to –5mA 1 10 mV
Oscillator Section
Frequency VCC = 5V to 30V 85 100 115 kHz
Error Amp Section
EAINV EAOUT = 2V –10 0 10 mV
I
EANV = –1mA –0.2 –0.9 V
I
EAINV EAOUT = 2V –0.2 –1.0 A
AVOL EAOUT = 0.5V to 3V 65 90 dB
EAOUT High EAINV = –100mV 3.6 4 4.4 V
EAOUT Low EAINV = 100mV 0.1 0.2 V
I
EAOUT EAINV = –100mV, EAOUT = 2V –350 –500 µA
EAINV = 100mV, EAOUT = 2V 7 20 mA
Unity Gain Bandwidth T
J = 25°C, F = 10kHz 0.6 1 MHz
Current Sense Comparator Section
Threshold 0.185 0.205 0.225 V
Input Bias Current CS = 0 –0.4 –1 µA
CS Propogation Delay 300 nS