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UC2843BD View Datasheet(PDF) - ON Semiconductor

Part Name
Description
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UC2843BD Datasheet PDF : 21 Pages
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UC3842B, UC3843B, UC2842B, UC2843B, NCV3843BV
ELECTRICAL CHARACTERISTICS (VCC = 15 V [Note 1], RT = 10 k, CT = 3.3 nF. For typical values TA = 25°C, for min/max values
TA is the operating ambient temperature range that applies [Note 2], unless otherwise noted.)
UC284XB
UC384XB, XBV
Characteristics
Symbol Min Typ Max Min Typ Max Unit
REFERENCE SECTION
Reference Output Voltage (IO = 1.0 mA, TJ = 25°C)
Line Regulation (VCC = 12 V to 25 V)
Load Regulation (IO = 1.0 mA to 20 mA)
Temperature Stability
Total Output Variation over Line, Load, and Temperature
Output Noise Voltage (f = 10 Hz to 10 kHz, TJ = 25°C)
Long Term Stability (TA = 125°C for 1000 Hours)
Output Short Circuit Current
OSCILLATOR SECTION
Frequency
TJ = 25°C
TA = Tlow to Thigh
TJ = 25°C (RT = 6.2 k, CT = 1.0 nF)
Frequency Change with Voltage (VCC = 12 V to 25 V)
Frequency Change with Temperature, TA = Tlow to Thigh
Oscillator Voltage Swing (Peak−to−Peak)
Discharge Current (VOSC = 2.0 V)
TJ = 25°C, TA = Tlow to Thigh
UC284XB, UC384XB
TA = Tlow to Thigh UC384XBV
ERROR AMPLIFIER SECTION
Voltage Feedback Input (VO = 2.5 V)
Input Bias Current (VFB = 5.0 V)
Open Loop Voltage Gain (VO = 2.0 V to 4.0 V)
Unity Gain Bandwidth (TJ = 25°C)
Power Supply Rejection Ratio (VCC = 12 V to 25 V)
Output Current
Sink (VO = 1.1 V, VFB = 2.7 V)
Source (VO = 5.0 V, VFB = 2.3 V)
Output Voltage Swing
High State (RL = 15 k to ground, VFB = 2.3 V)
Low State (RL = 15 k to Vref, VFB = 2.7 V)
UC284XB, UC384XB
UC384XBV
Vref
Regline
Regload
TS
Vref
Vn
S
ISC
fOSC
DfOSC/DV
DfOSC/DT
VOSC
Idischg
VFB
IIB
AVOL
BW
PSRR
ISink
ISource
VOH
VOL
4.95
4.9
− 30
49
48
225
7.8
7.5
2.45
65
0.7
60
2.0
− 0.5
5.0
5.0
2.0
3.0
0.2
50
5.0
− 85
52
250
0.2
1.0
1.6
8.3
2.5
− 0.1
90
1.0
70
12
−1.0
6.2
0.8
5.05
20
25
5.1
−180
55
56
275
1.0
8.8
8.8
2.55
−1.0
1.1
4.9
4.82
− 30
49
48
225
7.8
7.6
7.2
2.42
65
0.7
60
2.0
− 0.5
5.0
5.0
2.0
3.0
0.2
50
5.0
− 85
52
250
0.2
0.5
1.6
8.3
2.5
− 0.1
90
1.0
70
12
−1.0
6.2
0.8
0.8
5.1
20
25
5.18
−180
55
56
275
1.0
8.8
8.8
8.8
2.58
− 2.0
1.1
1.2
V
mV
mV
mV/°C
V
mV
mV
mA
kHz
%
%
V
mA
V
mA
dB
MHz
dB
mA
V
CURRENT SENSE SECTION
Current Sense Input Voltage Gain (Notes 3 and 4)
AV
UC284XB, UC384XB
UC384XBV
V/V
2.85 3.0 3.15 2.85 3.0 3.15
2.85 3.0 3.25
Maximum Current Sense Input Threshold (Note 3)
Vth
UC284XB, UC384XB
UC384XBV
V
0.9 1.0 1.1 0.9 1.0 1.1
0.85 1.0
1.1
Power Supply Rejection Ratio (VCC = 12 V to 25 V, Note 3)
PSRR
70
70
dB
Input Bias Current
IIB
− − 2.0 −10
− − 2.0 −10
mA
Propagation Delay (Current Sense Input to Output)
tPLH(In/Out)
150 300
150 300
ns
1. Adjust VCC above the Startup threshold before setting to 15 V.
2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
Tlow = 0°C for UC3842B, UC3843B; −25°C for UC2842B, UC2843B; −40°C for UC3842BV, UC3843BV
Thigh = +70°C for UC3842B, UC3843B; +85°C for UC2842B, UC2843B; +105°C for UC3842BV, UC3843BV
NCV3843BV: Tlow = −40°C, Thigh = +105°C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and
change control.
3. This parameter is measured at the latch trip point with VFB = 0 V.
4.
Comparator gain is defined as: AV
DV Output Compensation
DV Current Sense Input
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