UC3841 Selling Leads, Price trend, UC3841 DataSheet download, circuit diagram from SeekIC.com

Features: · All Control, Driving, Monitoring, and Protection Functions Included· Low-current, Off-line Start Circuit· Voltage Feed Forward or Current Mode Control· Guaranteed Duty Cycle Clamp· PWM Latch for Single Pulse per Period· Pulse-by-Pulse Current Limiting Plus Shutdown for Over-Current Fau...

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SeekIC No. : 004535620 Detail

UC3841: Features: · All Control, Driving, Monitoring, and Protection Functions Included· Low-current, Off-line Start Circuit· Voltage Feed Forward or Current Mode Control· Guaranteed Duty Cycle Clamp· PWM L...

UC3841 Data Sheet

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Part Number:: UC3841
Supply Ability:: 5000

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Product Details

Description

Features:

· All Control, Driving, Monitoring, and Protection Functions Included
· Low-current, Off-line Start Circuit
· Voltage Feed Forward or Current Mode Control
· Guaranteed Duty Cycle Clamp
· PWM Latch for Single Pulse per Period
· Pulse-by-Pulse Current Limiting Plus Shutdown for Over-Current Fault
· No Start-up or Shutdown Transients
· Slow Turn-on Both Initially and After Fault Shutdown
· Shutdown Upon Over- or Under-Voltage Sensing
· Latch Off or Continuous Retry After Fault
· PWM Output Switch Usable to 1A
· 500kHz Operation
· 18 Pin DIL Package
· 500kHz Operation
· 18 Pin DIL Package
· 1% Reference Accuracy
· 500kHz Operation
· 18 Pin DIL Package

Pinout

Connection Diagram

Specifications

Supply Voltage, +V_IN (Pin 15) (Note 2)
Voltage Driven . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +32V
Current Driven, 100mA maximum. . . . . . . . . . . .. .. . Self-limiting
PWM Output Voltage (Pin 12) . . . . . . . . . . . . . . . . . . . . . . . 40V
PWM Output Current, Steady-State (Pin 12) . . . . . . .. . . 400mA
PWM Output Peak Energy Discharge . . . . . . . . . . . . . 20Joules
Driver Bias Current (Pin 14) . . . . . . . . . . . . . . . . . . . . .. -200mA
Reference Output Current (Pin 16) . . . . . . . . . . . . . . . .. -50mA
Slow-Start Sink Current (Pin 8) . . . . . . . . . . . . . . . . . . .. . 20mA
VIN Sense Current (Pin 11). . . . . . . . . . . . . . . . . . . . . . . . 10mA
Current Limit Inputs (Pins 6 & 7) . . . . . . . . . . . . . .-0.5 to +5.5V
Stop Input (Pin 4) . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 to +5.5V
Comparator Inputs
(Pins 1, 7, 9-11, 16) . . . . . . . . . . . .. . Internally clamped at 12V
Power Dissipation at TA = 25°C (Note 3) . . . . . . . . . . 1000mW
Power Dissipation at TC = 25°C (Note 3) . . . . . . . . . . 2000mW
Operating Junction Temperature . . . . . . . . .. -55°C to +150°C
Storage Temperature Range. . . . . . . . . . . . . -65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . +300°C

Note 1: All voltages are with respect to ground, Pin 13.
Currents are positive-into, negative-out of the specified terminal.
Note 2: All pin numbers are referenced to DIL-18 package.
Note 3: Consult Packaging Section of Databook for thermal limitations and considerations of package.

Description

The UC1841 family of PWM controllers has been designed to increase he level of versatility while retaining all of the performance features of he earlier UC1840 devices. While still optimized for highly-efficient bootstrapped rimary-side operation in forward or flyback power converters, he UC1841 is equally adept in implementing both low and high voltage nput DC to DC converters. Important performance features include a ow-current starting circuit, linear feed-forward for constant volt-second peration, and compatibility with either voltage or current mode topologies.

In addition to start-up and normal regulating PWM functions, these devices UC1841 nclude built in protection from over-voltage, under-voltage, and ver-current fault conditions with the option for either latch-off or automatic estart.

While pin compatible with the UC1840 in all respects except that the polarity f the External Stop has been reversed, the UC1841 offers the following mprovements:
1. Fault latch reset is accomplished with slow start discharge rather than recycling the input voltage to the chip.
2. The External Stop input can be used for a fault delay to resist shutdown from short duration transients.
3. The duty-cycle clamping function has been characterized and specified.

The UC1841 is characterized for -55°C to +125°C operation while the UC1841 and UC3841 are designed for -25°C to +85°C and 0°to +70°C,respectively.

UC3841

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