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UCC2839

Features: · Practical Secondary Side Control of Isolated Power Supplies· Provides a Self Regulating Bias Supply From a High Input Voltage Using an External N-Channel Depletion Mode FET· Onboard Precision, Fixed Gain, Differential Current Sense Amplifier· Wide Bandwidth Current Error Amplifier· 5V ...

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UCC2839: Features: · Practical Secondary Side Control of Isolated Power Supplies· Provides a Self Regulating Bias Supply From a High Input Voltage Using an External N-Channel Depletion Mode FET· Onboard Prec...

UCC2839 Data Sheet

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Part Number:
UCC2839
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

· Practical Secondary Side Control of Isolated Power Supplies
· Provides a Self Regulating Bias Supply From a High Input Voltage Using an External N-Channel Depletion Mode FET
· Onboard Precision, Fixed Gain, Differential Current Sense Amplifier
· Wide Bandwidth Current Error Amplifier
· 5V Reference
· High Current, Programmable Gm Amplifier Optimized to Drive Opto-couplers


Pinout

Connection Diagram


Specifications

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V
Supply Curren
(LED not connected) . . . . . . . . . . . . . . . . . . . . . . . . . .. 2mA
(LED connected) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14mA
Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . .0.3V to 15V
Power Dissipation at TA = 60°C
(LED not connected). . . . . . . . . . . . . . . . . . . . . . . . . . 20mW
(LED connected). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55mW
Storage Temperature . . . . . . . . . . . . . . 65°C to +150°C
Junction Temperature. . . . . . . . . . . . . . .55°C to +150°C
Lead Temperature (Soldering, 10sec.) . . . . . . . . . . +300°C

Currents are positive into, negative out of the specified terminal.
Consult Packaging Section of Databook for thermal limitations and considerations of package.


Description

The UCC3839 provides the control functions for secondary side average current mode control in isolated power supplies. Start up, pulse width modulation and MOSFET drive must be accomplished independently on the primary side. Communication from secondary to primary side is anticipated through an opto-isolator.

Accordingly, the UCC3839 contains a fixed gain current sense amplifier, voltage and current error amplifiers, and a Gm type buffer/driver amplifier for the opto-isolator. Additional housekeeping functions include a precision 5V reference and a bias supply regulator.

Power for the UCC3839 can be generated by peak rectifying the voltage of the secondary winding of the isolation transformer. From this unregulated voltage, the UCC3839's bias supply regulator will generate its own 7.5V bias supply using an external, N-channel, depletion mode FET.

The UCC3839 can be configured for traditional average current mode control where the output of the voltage error amplifier commands the current error amplifier. It can also be configured for output voltage regulation with average current mode short circuit current limiting, employing two parallel control loops regulating the output voltage and output current independently.




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