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UC2826

Features: • Practical Secondary Side Control of Isolated Power Supplies• 1MHz Operation• Tailored Loop Bandwidth Provides Excellent Noise Immunity• Voltage Feedforward Provides Superior Transient Response• Accurate Programmable Maximum Duty Cycle• Multiple Chips...

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SeekIC No. : 004535462 Detail

UC2826: Features: • Practical Secondary Side Control of Isolated Power Supplies• 1MHz Operation• Tailored Loop Bandwidth Provides Excellent Noise Immunity• Voltage Feedforward Provid...

UC2826 Data Sheet

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Part Number:
UC2826
Supply Ability:
5000

Price Break

  • 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
• 1MHz Operation
• Tailored Loop Bandwidth Provides Excellent Noise Immunity
• Voltage Feedforward Provides Superior Transient Response
• Accurate Programmable Maximum Duty Cycle
• Multiple Chips Can be Synchronized to Fastest Oscillator
• Wide Gain Bandwidth Product (70MHz, Acl>10) Current Error Amplifier
• Up to Ten Devices Can Easily Share a Common Load



Pinout

Connection Diagram


Specifications

Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . .  .20V
Output Current Source or Sink . . . . . . . . . . . . . . . . . . . . . .0.3A
Analog Input Voltages . . . . . . . . . . . . . . . . . . . . . . .-0.3V to 7V
ILIM, KILL, SEQ, ENBL, RUN, PWRSEN, PWROK . . .  .-0.3V to 7V
CLKSYN Current Source . . . . . . . . . . . . . . . . . . . . . . .  . . .20mA
RUN Current Sink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  .20mA
SEQ Current Sink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  .20mA
RDEAD Current Sink . . . . . . . . . . . . . . . . . . . . . . . . . . . .  .20mA
RAMP Current Sink . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .20mA
Share Bus Voltage (voltage with respect to GND) . . .0V to 6.2V
ADJ Voltage (voltage with respect to GND) . . . . . . .0.9V to 6.3V
VEE (voltage with respect to GND) . . . . . . . . . . . . . . . . .. .-1.5V
Storage Temperature . . . . . . . . . . . . . . . . .  -65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . 65°C to +150°C
Lead Temperature (Soldering, 10 sec.) . . . . . . . . .. . . .+300°C

All voltages with respect to VEE except where noted; all currents are positive into, negative out of the specified  terminal.
Consult Packaging Section of Databook for thermal limitations and considerations of packages.



Description

The UC1826 family of average current mode controllers accurately ccomplishes secondary side average current mode control. The secondary ide output voltage is regulated by sensing the output voltage nd differentially sensing the AC switching current. The sensed output oltage drives a voltage error amplifier.The AC switching current, monitored y a current sense resistor, drives a high bandwidth, low offset urrent error amplifier. The output of the voltage error amplifier can be sed to drive the current amplifier which filters the measured inductor urrent. Fast transient response is accomplished by utilizing voltage eedforward in generating the PWM ramp.

The UC1826 features load share, oscillator synchronization, undervoltage ockout, and programmable output control. Multiple chip operation an be achieved by connecting up to ten UC1826 chips in parallel.The HARE bus and CLKSYN bus provide load sharing and synchronization o the fastest oscillator respectively. With its tailored bandwidth, the C1826 provides excellent noise immunity and is an ideal controlle




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