UC2845BD1013TR STMicroelectronics, UC2845BD1013TR Datasheet - Page 12

• Manufacturer Part Number: UC2845BD1013TR
• Description: IC CTRLR PWM CURR-MODE HP 8-SOIC
• Manufacturer: STMicroelectronics

Specifications of UC2845BD1013TR

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 500kHz
• Duty Cycle: 50%
• 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: -25°C ~ 85°C
• Package / Case: 8-SOIC (3.9mm Width)
• Frequency-max: 500kHz
• Number Of Pwm Outputs: 1
• On/off Pin: No
• Adjustable Output: No
• Topology: Boost/Flyback
• Switching Freq: 500KHz
• Operating Supply Voltage (max): 30V
• Output Current: 1000A
• Synchronous Pin: No
• Rise Time: 50ns
• Fall Time: 50ns
• Operating Temperature Classification: Automotive
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: SO
• Duty Cycle (max): 50 %
• Output Voltage: 4.95 V to 5.05 V
• Mounting Style: SMD/SMT
• Switching Frequency: 500 KHz
• Operating Supply Voltage: 30 V
• Maximum Operating Temperature: + 150 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 497-3679-2

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