Enhanced Voltage Mode PWM Controller for Forward or Flyback

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Overview

The CS51221 Enhanced Voltage Mode PWM Controller contains all of the features necessary for basic voltage mode operation. This PWM controller has been optimized for high frequency primary side control operation. In addition, this device includes such features as: Soft Start, accurate duty cycle limit control, less than 50uA startup current, over and under voltage protection and bidirectional synchronization. The CS51221 is available in a SOIC-16 and TSSOP-16 surface mount packages.

  • Hot Swap - DC-DC Conversion
  • 1MHz Frequency Capability
  • Fixed Frequency Voltage Mode Operation, with Feed Forward
  • Thermal Shutdown
  • Under Voltage Lock-out
  • Accurate Programmable Max Duty Cycle Limit
  • 1A Sink/Source Gate Drive
  • Programmable Pulse-by-Pulse Overcurrent Protection
  • Leading Edge Current Sense Blanking
  • 75ns Shutdown Propagation Delay
  • Programmable Soft Start
  • Undervoltage Protection
  • Overvoltage Protection with Programmable Hysteresis
  • Bi-directional Synchronization
  • 25ns GATE Rise and Fall Time (1nF load)
  • 3.3V 3% Reference Voltage Output
  • Pb-Free Package is Available

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Product

Status

ECAD Models

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Package Type

Case Outline

MSL Type

MSL Temp (°C)

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Container Qty.

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Control Mode

fsw Typ (kHz)

Stand-by Mode

UVLO (V)

Short Circuit Protection

Latch

Soft Start

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Pricing ($/Unit)

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CS51221EDR16G

Active

Pb

A

H

P

SOIC-16

1

260

REEL

2500

N

Forward

Voltage Mode

Up to 1000

No

Yes

No

Yes

Yes

15

1000

$1.2

More Details

CS51221EDTB16G

Obsolete

Pb

A

H

P

TSSOP-16

1

260

TUBE

96

N

Forward

Voltage Mode

Up to 1000

No

Yes

No

Yes

Yes

15

1000

Price N/A

More Details

CS51221EDTB16R2G

Obsolete

Pb

A

H

P

TSSOP-16

1

260

REEL

2500

N

Forward

Voltage Mode

Up to 1000

No

Yes

No

Yes

Yes

15

1000

Price N/A

More Details

CS51221ED16G

Obsolete

Pb

A

H

P

SOIC-16

1

260

TUBE

48

N

Forward

Voltage Mode

Up to 1000

No

Yes

No

Yes

Yes

15

1000

Price N/A

More Details

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