UC3843BVD1R2 ON Semiconductor, UC3843BVD1R2 Datasheet - Page 7
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UC3843BVD1R2
Manufacturer Part Number
UC3843BVD1R2
Description
IC CTRLR CURRENT MODE HP 8SOIC
Manufacturer
ON Semiconductor
Datasheet
1.UC3842BDR2G.pdf
(21 pages)
Specifications of UC3843BVD1R2
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
-40°C ~ 105°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
+ 105 C
Fall Time
50 ns
Minimum Operating Temperature
- 40 C
Rise Time
50 ns
Synchronous Pin
No
Topology
Boost, Flyback, Forward
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
UC3843BVD1R2OSTR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
UC3843BVD1R2G
Manufacturer:
ST
Quantity:
15 600
Part Number:
UC3843BVD1R2G
Manufacturer:
ON/安森美
Quantity:
20 000
PIN FUNCTION DESCRIPTION
8−Pin
- 2.0
-1.0
3.0
2.0
1.0
1
2
3
4
5
6
7
8
0
0
0
Ä Ä Ä
14−Pin
2,4,6,1
V
Ä Ä Ä Ä
Ä Ä Ä Ä
10
12
14
11
Figure 16. Output Cross Conduction
Figure 14. Output Saturation Voltage
CC
1
3
5
7
8
9
3
T
A
Ä Ä Ä
Ä Ä Ä
T
= 25°C
A
200
= - 55°C
I
O
Compensation
, OUTPUT LOAD CURRENT (mA)
versus Load Current
Feedback
Function
Voltage
Current
Ground
Output
Sense
Power
R
Ä Ä Ä Ä Ä
Ä Ä Ä Ä Ä
Ä Ä Ä Ä
Ä Ä Ä Ä
Ä Ä Ä Ä
Ä Ä Ä Ä
GND
GND
V
V
NC
T
V
CC
/C
ref
Source Saturation
(Load to Ground)
C
Sink Saturation
(Load to V
T
T
100 ns/DIV
A
= - 55°C
400
CC
This pin is the Error Amplifier output and is made available for loop compensation.
This is the inverting input of the Error Amplifier. It is normally connected to the switching power
supply output through a resistor divider.
A voltage proportional to inductor current is connected to this input. The PWM uses this
information to terminate the output switch conduction.
The Oscillator frequency and maximum Output duty cycle are programmed by connecting resistor
R
This pin is the combined control circuitry and power ground.
This output directly drives the gate of a power MOSFET. Peak currents up to 1.0 A are sourced
and sunk by this pin.
This pin is the positive supply of the control IC.
This is the reference output. It provides charging current for capacitor C
This pin is a separate power ground return that is connected back to the power source. It is used
to reduce the effects of switching transient noise on the control circuitry.
The Output high state (V
source connection, it can reduce the effects of switching transient noise on the control circuitry.
This pin is the control circuitry ground return and is connected back to the power source ground.
No connection. These pins are not internally connected.
)
T
to V
Ä Ä Ä Ä Ä
Ä Ä Ä Ä Ä
Ä Ä Ä Ä Ä
80 ms Pulsed Load
ref
Ä Ä Ä
Ä Ä Ä
Ä Ä
GND
600
120 Hz Rate
T
and capacitor C
V
V
C
T
A
CC
A
CC
L
= 25°C
= 25°C
= 15 pF
= 15 V
= 30 V
http://onsemi.com
800
OH
T
) is set by the voltage applied to this pin. With a separate power
to ground. Operation to 500 kHz is possible.
7
90%
10%
25
20
15
10
5
0
0
Figure 17. Supply Current versus Supply Voltage
Description
Figure 15. Output Waveform
10
V
CC
, SUPPLY VOLTAGE (V)
50 ns/DIV
20
T
through resistor R
Ä Ä Ä Ä
Ä Ä Ä Ä
Ä Ä Ä Ä
Ä Ä Ä Ä
R
C
V
I
T
Sense
A
T
T
FB
= 25°C
= 10 k
= 3.3 nF
= 0 V
30
V
C
T
= 0 V
A
CC
L
= 25°C
= 1.0 nF
= 15 V
T
.
40