
2
UCC1581
UCC2581
UCC3581
Supply Voltage (I
DD
≤
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, 0.1
μ
F capacitor
from VDD to GND, 1.0
μ
F capacitor from REF to GND, RT1 = 680k
, RT2 = 12k
, CT = 750pF and T
A
= T
J
.
PARAMETER
Reference Section
Output Voltage
I = –0.2mA
Load Regulation
–5.0mA < I < –0.2mA
Undervoltage Lockout Section
Start Threshold
Minimum Operating Voltage After Start
Hysteresis
Linear Preregulator Section
Regulated VDD Voltage
Regulated VDD to UVLO Delta
VDD Override Threshold
Oscillator Section
Frequency
25°C
Temperature Stability
(Note 1)
CT Peak Voltage
(Note 1)
CT Valley Voltage
(Note 1)
SYNC VIH
SYNC VIL
(Note 1)
PWM SECTION
Maximum Duty Cycle
Minimum Duty Cycle
(VC < 1.0V) DCMIN = 0V
(VC > 1.0V at start of cycle) DCMIN = 1.18V
Input Bias Current
(DCMIN), (Note 1)
(VC), (Note 1)
TEST CONDITIONS
MIN
TYP
MAX
UNITS
3.94
4.0
10
4.06
30
V
mV
6.7
6.2
0.2
7.3
6.8
0.5
7.9
7.4
0.8
V
V
V
7.0
100
7.5
230
8.0
600
8.2
V
mV
V
18
19.5
3.0
2.5
1.0
2.1
1.8
21
kHz
%
V
V
V
V
1.9
2.3
81
84
87
0
13
150
150
%
%
%
nA
nA
7
10
20
20
–150
–150
TEMPERATURE RANGE
–55°C to +125°C
–40°C to +85°C
–40°C to +85°C
0°C to +70°C
0°C to +70°C
PACKAGE
CDIP
SOIC
PDIP
SOIC
PDIP
UCC1581J
UCC2581D
UCC2581N
UCC3581D
UCC3581N
ORDERING INFORMATION