UC3843BD1 ON Semiconductor, UC3843BD1 Datasheet - Page 3
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UC3843BD1
Manufacturer Part Number
UC3843BD1
Description
IC CTRLR CURRENT MODE HP 8SOIC
Manufacturer
ON Semiconductor
Datasheet
1.UC3842BDR2G.pdf
(21 pages)
Specifications of UC3843BD1
Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
275kHz
Duty Cycle
96%
Voltage - Supply
8.2 V ~ 25 V
Buck
No
Boost
Yes
Flyback
Yes
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
Yes
Operating Temperature
0°C ~ 70°C
Package / Case
8-SOIC (3.9mm Width)
Frequency-max
275kHz
Duty Cycle (max)
96 %
Output Voltage
4.9 V to 5.1 V
Output Current
1000 mA
Mounting Style
SMD/SMT
Switching Frequency
500 KHz
Operating Supply Voltage
30 V
Maximum Operating Temperature
+ 70 C
Fall Time
50 ns
Minimum Operating Temperature
0 C
Rise Time
50 ns
Synchronous Pin
No
Topology
Boost, Flyback, Forward
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
UC3843BD1OS
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3. Adjust V
4. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
5. This parameter is measured at the latch trip point with V
6. Comparator gain is defined as: A
ELECTRICAL CHARACTERISTICS
T
REFERENCE SECTION
OSCILLATOR SECTION
ERROR AMPLIFIER SECTION
CURRENT SENSE SECTION
A
Reference Output Voltage (I
Line Regulation (V
Load Regulation (I
Temperature Stability
Total Output Variation over Line, Load, and Temperature
Output Noise Voltage (f = 10 Hz to 10 kHz, T
Long Term Stability (T
Output Short Circuit Current
Frequency
Frequency Change with Voltage (V
Frequency Change with Temperature, T
Oscillator Voltage Swing (Peak−to−Peak)
Discharge Current (V
Voltage Feedback Input (V
Input Bias Current (V
Open Loop Voltage Gain (V
Unity Gain Bandwidth (T
Power Supply Rejection Ratio (V
Output Current
Output Voltage Swing
Current Sense Input Voltage Gain (Notes 5 and 6)
Maximum Current Sense Input Threshold (Note 5)
Power Supply Rejection Ratio (V
Input Bias Current
Propagation Delay (Current Sense Input to Output)
T
T
is the operating ambient temperature range that applies [Note 4], unless otherwise noted.)
low
high
T
T
T
T
Sink (V
Source (V
High State (R
Low State (R
A
J
J
J
= 0°C for UC3842B, UC3843B; −25°C for UC2842B, UC2843B; −40°C for UC3842BV, UC3843BV
= 25°C
= 25°C (R
= 25°C, T
= T
= +70°C for UC3842B, UC3843B; +85°C for UC2842B, UC2843B; +105°C for UC3842BV, UC3843BV
CC
low
O
= 1.1 V, V
above the Startup threshold before setting to 15 V.
to T
O
= 5.0 V, V
A
T
L
L
high
= T
= 6.2 k, C
= 15 k to V
O
CC
= 15 k to ground, V
= 1.0 mA to 20 mA)
low
FB
Characteristics
OSC
A
= 12 V to 25 V)
FB
= 125°C for 1000 Hours)
= 5.0 V)
to T
J
FB
= 2.7 V)
= 2.0 V)
= 25°C)
O
O
T
O
high
= 2.3 V)
= 2.5 V)
ref
= 1.0 nF)
= 2.0 V to 4.0 V)
= 1.0 mA, T
T
, V
A
CC
CC
= T
FB
V
CC
= 12 V to 25 V, Note 5)
= 12 V to 25 V)
low
= 2.7 V)
DV Output Compensation
FB
DV Current Sense Input
= 12 V to 25 V)
UC284XB, UC384XB
UC284XB, UC384XB
UC284XB, UC384XB
UC284XB, UC384XB
A
to T
= 2.3 V)
(V
= T
J
CC
= 25°C)
high
J
low
= 25°C)
= 15 V [Note 3], R
to T
UC384XBV
UC384XBV
UC384XBV
UC384XBV
high
http://onsemi.com
FB
= 0 V.
t
Df
Df
PLH(In/Out)
Symbol
Reg
Reg
T
I
PSRR
PSRR
I
OSC
V
OSC
Source
A
f
dischg
I
V
V
V
V
V
BW
= 10 k, C
I
OSC
Sink
V
T
V
OSC
A
I
VOL
I
SC
3
S
IB
OH
IB
FB
OL
ref
ref
S
V
th
n
load
line
/DV
/DT
T
− 0.5
4.95
− 30
2.45
2.85
Min
225
= 3.3 nF. For typical values T
4.9
7.8
7.5
0.7
2.0
5.0
0.9
49
48
65
60
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
UC284XB
− 0.1
− 2.0
− 85
−1.0
Typ
250
150
5.0
2.0
3.0
0.2
5.0
0.2
1.0
1.6
8.3
2.5
1.0
6.2
0.8
3.0
1.0
50
52
90
70
12
70
−
−
−
−
−
−
−
−180
Max
5.05
2.55
−1.0
3.15
275
−10
300
5.1
1.0
8.8
8.8
1.1
1.1
20
25
55
56
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
− 0.5
4.82
− 30
2.42
2.85
2.85
0.85
Min
225
4.9
7.8
7.6
7.2
0.7
2.0
5.0
0.9
49
48
65
60
−
−
−
−
−
−
−
−
−
−
−
−
−
−
A
UC384XB, XBV
= 25°C, for min/max values
− 0.1
− 2.0
− 85
−1.0
Typ
250
150
5.0
2.0
3.0
0.2
5.0
0.2
0.5
1.6
8.3
2.5
1.0
6.2
0.8
0.8
3.0
3.0
1.0
1.0
50
52
90
70
12
70
−
−
−
−
−180
− 2.0
Max
5.18
2.58
3.15
3.25
275
−10
300
5.1
1.0
8.8
8.8
8.8
1.1
1.2
1.1
1.1
20
25
55
56
−
−
−
−
−
−
−
−
−
−
−
−
mV/°C
MHz
Unit
kHz
V/V
mV
mV
mV
mA
mA
mA
mV
mA
dB
dB
dB
mA
ns
%
%
V
V
V
V
V
V