UC3845BD STMicroelectronics, UC3845BD Datasheet - Page 3

• Manufacturer Part Number: UC3845BD
• Description: Switching Converters, Regulators & Controllers 0.5mA Current Mode
• Manufacturer: STMicroelectronics

Specifications of UC3845BD

• Output Voltage: 4.90 V to 5.10 V
• Switching Frequency: 52 kHz
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Package / Case: SO-8
• Duty Cycle (max): 50 %
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

THERMAL DATA
ELECTRICAL CHARACTERISTICS ( [note 1] Unless otherwise stated, these specifications apply for
-25 < T
REFERENCE SECTION
OSCILLATOR SECTION
ERROR AMP SECTION
CURRENT SENSE SECTION
Symbol
R
Symbol
V
f
PSRR
f
th j-amb
I
OSC
OSC
V
V
SVR
f
REF
dischg
BW
V
V
I
OSC
G
e
V
V
OSC
REF
SC
I
I
I
I
REF
REF
b
o
o
b
N
2
V
3
/ V
/ T
/ T Temperature Stability
amb
Thermal Resistance Junction-ambient.
< 85 C for UC284XB; 0 < T
Output Voltage
Line Regulation
Load Regulation
Total Output Variation
Output Noise Voltage
Long Term Stability
Output Short Circuit
Frequency
Frequency Change with Volt. V
Frequency Change with Temp.
Oscillator Voltage Swing
Discharge Current (V
Input Voltage
Input Bias Current
A
Unity Gain Bandwidth
Power Supply Rejec. Ratio
Output Sink Current
Output Source Current
V
V
Gain
Maximum Input Signal
Supply Voltage Rejection
Input Bias Current
Delay to Output
VOL
OUT
OUT
High
Low
Parameter
OSC
=2V) T
Description
T
12V
1
(Note 2)
Line, Load, Temperature
10Hz
(note 2)
T
(note 2)
T
T
T
T
(peak to peak)
T
V
V
2V
T
12V
V
V
V
R
V
R
(note 3 & 4)
V
12
amb
j
amb
j
A
J
A
J
A
J
CC
PIN1
FB
PIN2
PIN2
PIN2
PIN2
PIN1
L
L
= 25 C I
= 25 C
= 25°C (R
= 25°C
= 25°C
= T
= T
= T
= 15K
= 15K
I
= 5V
o
= 12V to 25V
Test Conditions
< 70 C for UC384XB; V
V
V
= 2.3V V
= 2.5V
= 2.7V V
= 2.3V;
= 2.7V;
= 5V (note 3)
V
low
low
low
V
i
=
o
f
i
20mA
i
to T
to T
to T
25V (note 3)
4V
125 C,
25V
25V
10KHz T
T
o
to Ground
to Pin 8
= 6.2k, C
= 1mA
high
high
high
PIN1
PIN1
= 5V
1000Hrs
j
= 1.1V
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
T
= 25 C
= 1nF)
max.
Min. Typ. Max. Min. Typ. Max.
4.95 5.00 5.05 4.90 5.00 5.10
2.45 2.50 2.55 2.42 2.50 2.58
2.85
225
-0.5
-30
4.9
7.8
7.5
0.7
0.9
49
48
65
60
–
–
–
2
5
i
= 15V (note 5); R
UC284XB
-100 -180
250
-0.1
150
Minidip
0.2
0.2
1.6
8.3
6.2
0.8
50
52
90
70
12
70
-1
-2
2
3
5
–
1
–
1
1
3
100
3.15 2.85
275
300
5.1
8.8
8.8
1.1
1.1
-10
20
25
25
55
56
-1
1
–
–
4.82
-0.5
225
-30
7.8
7.6
0.7
0.9
49
48
65
60
–
–
–
2
5
SO8
T
UC384XB
150
= 10K; C
-100 -180
250
-0.1
150
0.2
0.5
8.3
6.2
0.8
0.2
1.6
50
52
90
70
12
70
-2
-1
2
3
5
–
–
1
3
1
5.18
3.15
275
300
8.8
8.8
1.1
1.1
-10
20
25
25
55
56
-2
1
–
–
T
= 3.3nF)
Unit
C/W
mV/ C
Unit
MHz
KHz
KHz
KHz
V/V
mV
mV
mV
mA
mA
mA
mA
mA
dB
dB
dB
ns
%
%
V
V
V
V
V
V
V
3/15
V
A
A