UC3845BD STMicroelectronics, UC3845BD Datasheet - Page 12
UC3845BD
Manufacturer Part Number
UC3845BD
Description
Switching Converters, Regulators & Controllers 0.5mA Current Mode
Manufacturer
STMicroelectronics
Datasheet
1.UC3844BD.pdf
(15 pages)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
UC3845BD1
Manufacturer:
ST
Quantity:
18 420
Company:
Part Number:
UC3845BD1013TR
Manufacturer:
STM
Quantity:
12 500
Part Number:
UC3845BD1013TR
Manufacturer:
ST
Quantity:
20 000
Company:
Part Number:
UC3845BD1G
Manufacturer:
ON Semiconductor
Quantity:
2 000
Part Number:
UC3845BD1R2G
Manufacturer:
ON/安森美
Quantity:
20 000
Figure 24: Soft-Start Circuit
UC2842B/3B/4B/5B - UC3842B/3B/4B/5B
Figure 25: Soft-Start and Error Amplifier Output Duty Cycle Clamp.
12/15
C
R2
R1
BC109
C
8
4
2
1
1M
+
-
EA
V
8
4
2
1
CLAMP
+
R
R
=
1mA
·
+
-
R
1
EA
R
+ R
1
2
BIAS
OSC
2R
+
where 0 <V
R
R
R
1mA
5
V
Clamp
BIAS
OSC
CLAMP
1V
2R
<1V
R
+
+
-
-
5V
5
I
pk(max)
ref
Comp/Latch
=
5V
1V
S
R
ref
Q
V
CLAMP
R
S
+
+
-
-
+
D95IN354
-
7
S
R
Q
D95IN355
7
6
5
V
CC
R
S
V
in
Q1