Datasheet

2
UCC1581
UCC2581
UCC3581
Supply Voltage (IDD ≤ 10mA). . . . . . . . . . . . . . . . . . . . . . . . 15V
Supply Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA
V
REF
Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –10mA
OUT Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 1A
Analog Inputs
EN . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to (VDD + 0.3V)
VC, ISEN, SYNC, DCMIN. . . . . . . . . . –0.3V to (V
REF
+ 0.3V)
Power Dissipation at T
D
= 25°C
(N, J, Q, L Package) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W
(D Package) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.65W
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . –55C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C
Unless otherwise specified, all voltages are with respect to
Ground. Currents positive into, negative out of the specified ter
-
minal. Consult Packaging Section of Databook for thermal limi
-
tations and considerations of packages.
ABSOLUTE MAXIMUM RATINGS
CONNECTION DIAGRAMS
DIL-14, SOIC-14 (Top View)
N or J, D Packages
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, these specifications apply for VDD = 10V, 0.1µF capacitor
from VDD to GND, 1.0µF capacitor from REF to GND, RT1 = 680kΩ, RT2 = 12kΩ, CT = 750pF and T
A =TJ.
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Reference Section
Output Voltage I = –0.2mA 3.94 4.0 4.06 V
Load Regulation –5.0mA < I < –0.2mA 20 45 mV
Undervoltage Lockout Section
Start Threshold 6.7 7.3 7.9 V
Minimum Operating Voltage After Start 6.2 6.8 7.4 V
Hysteresis 0.2 0.5 0.8 V
Linear Preregulator Section
Regulated VDD Voltage 7.0 7.5 8.0 V
Regulated VDD to UVLO Delta 100 230 600 mV
VDD Override Threshold 8.2 V
Oscillator Section
Frequency 25°C 18 19.5 21 kHz
Temperature Stability (Note 1) 3.0 %
CT Peak Voltage (Note 1) 2.5 V
CT Valley Voltage (Note 1) 1.0 V
SYNC VIH 1.9 2.1 2.3 V
SYNC VIL (Note 1) 1.8 V
PWM SECTION
Maximum Duty Cycle 81 84 87 %
Minimum Duty Cycle (VC < 1.0V) DCMIN = 0V 0 %
(VC > 1.0V at start of cycle) DCMIN = 1.18V 7 10 13 %
Input Bias Current (DCMIN), (Note 1) –150 20 150 nA
(VC), (Note 1) –150 20 150 nA
TEMPERATURE RANGE PACKAGE
UCC1581J –55°C to +125°C CDIP
UCC2581D –40°C to +85°C SOIC
UCC2581N –40°C to +85°C PDIP
UCC3581D 0°C to +70°C SOIC
UCC3581N 0°C to +70°C PDIP
ORDERING INFORMATION