UC2851 Selling Leads, Price trend, UC2851 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· High Current Totem Pole Output· 50% Absolute Max Duty Cycle· PWM Latch for Single Pulse Per Period· Pulse-by-Pulse Current Limiting plu...

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SeekIC No. : 004535498 Detail

UC2851: Features: · All Control, Driving, Monitoring, and Protection Functions Included· Low-Current Off Line Start Circuit· Voltage Feed Forward or Current Mode Control· High Current Totem Pole Output· 50%...

UC2851 Data Sheet

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Part Number:: UC2851
Supply Ability:: 5000

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1~5000

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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
· High Current Totem Pole Output
· 50% Absolute Max Duty Cycle
· 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
· 1% Reference Accuracy
· 500kHz Operation
· 18 Pin DIL or 20 Pin PLCC Package

Pinout

Connection Diagram

Specifications

Supply Voltage, +VIN (Pin 15)
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 . . . . . . . . . . . 20mJoules
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 17, 911, 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 UC1851 family of PWM controllers are optimized for offline primary side control. These devices include a high current totem pole output stage and a toggle flip-flop for absolute 50% duty cycle limiting. In all other respects this line of controllers is pin for pin compatible with the UC1841 series. Inclusion of all major housekeeping functions in these high performance controllers makes them ideal for use in cost sensitive applications.

Important features of these controllers include low current start-up, linear feed-forward for constant volt-second operation, and compatibility with both voltage or current mode control. In addition, these devices include a programmable start threshold, as well as programmable over-voltage, under-voltage, and over current fault thresholds. The fault latch on these devices can be configured for automatic restart, or latched off response to a fault.

These devices are packaged in 18-pin plastic or ceramic dualin- line packages, or for surface mount applications, a 20 Pin PLCC. The UC1851 is characterized for -55°C to +125°C operation while the UC2851 and UC3851 are designed for -40°C to +85°C and 0°C to +70°C, respectively.

UC2851

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