Datasheet

UC1842A-EP, UC1843A-EP, UC1844A-EP, UC1845A-EP
CURRENT-MODE PWM CONTROLLER
SGLS134D − SEPTEMBER 2002 − REVISED JANUARY 2013
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†‡
V
CC
voltage (low impedance source) 30 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
V
CC
voltage (I
CC
mA) self limiting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output current, I
O
±1 A. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output energy (capacitive load) 5 μJ. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Analog Inputs (pins 2, 3) −0.3 V to 6.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Error Amp Output Sink current 10 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation at T
A
< 25_C 1 W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θ
JA
(see Note 1): 97°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
−65_C to 150_C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum junction temperature, T
J
150_C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature soldering 1,6 mm (1/16 inch) from case for 10 seconds 260_C. . . . . . . . . . . . . . . . . . . . . . .
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
‡
Unless otherwise indicated, voltages are reference to ground and currents are positive into and negative out of the specified terminals.
NOTE 1: Long term high-temperature storage and/or extended use at maximum recommended operating conditions may result in a reduction
of overall device life. See http://www.ti.com/ep_quality for additional information on enhanced plastic packaging.
electrical characteristics, T
A
= −55_C to 125_C for the UC184xAM-EP, V
CC
= 15 V (see Note 1),
R
T
= 10 kΩ, C
T
= 3.3 nF, and T
A
= T
J
(unless otherwise stated)
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Reference Section
Output voltage
T
J
= 25_C, I
O
= 1 mA
4.95 5 5.05 V
Line regulation voltage V
IN
= 12 V to 25 V 6 20 mV
Load regulation voltage I
O
= 1 mA to 20 mA 6 25 mV
Temperature stability See Notes NO TAG and NO TAG 0.2 0.4
mV/_C
Total output variation voltage Line, Load, Temp. 4.9 5.1 V
Output noise voltage
f = 10 Hz to 10 kHz,
See Note NO TAG
T
J
= 25_C
50 μV
Long term stability 1000 hours, See Note 2
T
A
= 125_C
5 25 mV
Output short-circuit current −30 −100 −180 mA
Oscillator Section
Initial accuracy See Note NO TAG
T
J
= 25_C
47 52 57 kHz
Voltage stability V
CC
= 12 V to 25 V 0.2% 1%
Temperature stability T
A
= MIN to MAX, See Note 2 5%
Amplitude peak-to-peak V pin 4, See Note 2 1.7 V
Discharge current
V pin 4 2 V See Note 3
T
J
= 25_C
7.8 8.3 8.8
mA
Discharge current V pin 4 = 2 V, See Note 3
T
J
= Full range 7.5 8.8
mA
NOTES: 1. Adjust V
CC
above the start threshold before setting at 15 V.
2. Not production tested.
3. This parameter is measured with R
T
= 10 kΩ to V
REF
. This contributes approximately 300 μA of current to the measurement. The
total current flowing into the R
T/C
pin will be approximately 300 μA higher than the measured value.