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UC1848 Datasheet(PDF) 3 Page - Texas Instruments

Part No. UC1848
Description  Average Current Mode PWM Controller
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

UC1848 Datasheet(HTML) 3 Page - Texas Instruments

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UC1848
UC2848
UC3848
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, all specifications are over the junction temperature range
of
−55°C to +125°C for the UC1848, −40°C to +85°C for the UC2848, and 0°C to +70°C for the UC3848. Test conditions are: VCC
= 12V, CT = 400pF, CI = 100pF, IOFF = 100
µA, CDC = 100nF, Cvs = 100pF, and Ivs = 400µA, TA = TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Oscillator
Frequency
TA = 25°C
240
250
260
kHz
235
265
kHz
Ramp Amplitude
1.5
1.65
1.8
V
Duty Cycle Clamp
Max Duty Cycle
V(DMAX) = 0.75
• VREF
73.5
76.5
79.5
%
Volt Second Clamp
Max On Time
900
1100
ns
VCC Comparator
Turn-on Threshold
13
14
V
Turn-off Threshold
910
V
Hysteresis
2.5
3
3.5
V
UV Comparator
Turn-on Threshold
4.1
4.35
4.6
V
RHYSTERESIS
Vuv = 4.2V
77
90
103
k
Reference
VREF
TA = 25°C
4.95
5
5.05
V
0
< IO < 10mA, 12 < VCC < 20
4.93
5.07
V
Line Regulation
12 < VCC < 20V
4
15
mV
Load Regulation
0 < IO < 10mA
3
15
mV
Short Circuit Current
VREF = 0V
30
50
70
mA
Output Stage
Rise & Fall Time (Note 1)
Cl = 1nF
20
45
ns
Output Low Saturation
IO = 20mA
0.25
0.4
V
IO = 200mA
1.2
2.2
V
Output High Saturation
IO = -200mA
2.0
3.0
V
UVLO Output Low Saturation
IO = 20mA
0.8
1.2
V
ICC
ISTART
VCC = 12V
0.2
0.4
mA
ICC (pre-start)
VCC = 15V, V(UV) = 0
0.5
1
mA
ICC (run)
22
26
mA
Note 1: Guaranteed by design.
Under Voltage Lockout
The Under Voltage Lockout block diagram is shown in
Fig 1. The VCC comparator monitors chip supply voltage.
Hysteretic thresholds are set at 13V and 10V to facilitate
off-line applications. If the VCC comparator is low, ICC is
low (<500
µA) and the output is low.
The UV comparator monitors input line voltage (VIN). A
pair of resistors divides the input line to UV. Hysteretic in-
put line thresholds are programmed by Rv1 and Rv2.
The thresholds are
VIN(on) = 4.35V • (1 + Rv1/Rv2′) and
VIN(off) = 4.35V • (1 + Rv1/Rv2) where
Rv2
′= Rv2||90k.
The resulting hysteresis is
VIN(hys) = 4.35V • Rv1 / 90k.
When the UV comparator is low, ICC is low (500µA) and
the output is low.
APPLICATION INFORMATION


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