UC3843A-BW Datasheet PDF - FCI
| Part Number | UC3843A-BW | |
| Description | Current Mode PWM Controller | |
| Manufacturers | FCI | |
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There is a preview and UC3843A-BW download ( pdf file ) link at the bottom of this page. Total 10 Pages | ||
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UC384XA-BW Current Mode PWM Controller
(UC3842A-BW/43A-BW/44A-BW/45A-BW)
DESCRIPTION
The UC3842A-BW/43A-BW/44A-BW/45A-BW are fixed frequency current mode PWM
controller. They are specially designed for OFF−Line and DC to DC converter applications
with a minimal external components. Internally implemented circuits include a trimmed
PIN
CONNECTION
(TOP VIEW)
oscillator for precise duty cycle control, a temperature compensated reference, high gain
error amplifier, current sensing comparator, and a high current totempole output ideally
suited for driving a power MOSFET. Protection circuitry includes built undervoltage lockout
and current limiting.
The UC3842A-BW and UC3844A-BW have UVLO thresholds of 16 V (on) and 10 V (off). The
corresponding thresholds for the UC3843A-BW/45A-BW are 8.4V (on) and
7.6V (off).
The UC3842A-BW and UC3843A-BW can operate within 100% duty cycle. The UC3844A-BW
and UC3845A-BW can operate within 50% duty cycle.
The UC384XA-BW has Start-Up Current 0.17mA (typ).
The UC384XA-BW are revised UC384XAM and differ by higher Unity Gain bandwidth of Error Amplifier.
FEATURES
• Low Start-Up and Operating Current
• High Current Totem Pole Output
• Undervoltage Lockout With Hysteresis
• Operating Frequency Up To 500KHz
BLOCK DIAGRAM
(toggle flip flop used only in UC3844, UC3845)
Absolute Maximum Ratings
Characteristic
Supply Voltage (low impedance
source)
Output Current
Input Voltage (Analog Inputs pins 2,3)
Error Amp Output Sink Current
Power Dissipation (TA=250C)
Storage Temperature Range
Lead Temperature (soldering 5 sec.)
Symbol
VCC
IO
VI
ISINK (E.A)
PO
Tstg
TL
Value
30
±1
−0.3 to 5.5
10
1
-65 to150
260
Unit
V
A
V
mA
W
oC
oC
1
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UC384XA-BW Current Mode PWM Controller
(UC3842A-BW/43A-BW/44A-BW/45A-BW)
SCR must be selected for a holding current of less than 0.5mA.
The simple two transistor circuit can be used in place of the SCR as shown.
Figure 5. Latched Shutdown
Figure 6. Error Amplifier Compensation
5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for UC3843A-BW electronic component. |
| Information | Total 10 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ UC3843A-BW.PDF Datasheet ] | |
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Featured Datasheets
| Part Number | Description | MFRS |
| UC3843A-BW | The function is Current Mode PWM Controller. FCI | |
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