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Si9121

Features: ` Fixed +5-V or +3.3-V Output` Integrated Floating Feedback Amplifier` On-Chip 70-V, 1.5- N-ChannelMOSFET Switch` Integrated High Voltage Start-Up Circuit,with VCC Regulator` 10-V to 60-V Input Voltage Range` 95-kHz PWM Operation` Integrated Soft-Start and Oscillator` High Efficiency Ove...

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SeekIC No. : 004490893 Detail

Si9121: Features: ` Fixed +5-V or +3.3-V Output` Integrated Floating Feedback Amplifier` On-Chip 70-V, 1.5- N-ChannelMOSFET Switch` Integrated High Voltage Start-Up Circuit,with VCC Regulator` 10-V to 60-V ...

Si9121 Data Sheet

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Part Number:
Si9121
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:

` Fixed +5-V or +3.3-V Output
` Integrated Floating Feedback Amplifier
` On-Chip 70-V, 1.5- N-Channel
MOSFET Switch
` Integrated High Voltage Start-Up Circuit,
with VCC Regulator
` 10-V to 60-V Input Voltage Range
` 95-kHz PWM Operation
` Integrated Soft-Start and Oscillator
` High Efficiency Over Full Load Range
` Under Voltage Lockout
` Current Mode Control
` Hiccup Mode Short Circuit
Protection
` Thermal Shutdown
` SOIC-8 Narrow-Body Package




Pinout

Connection Diagram




Specifications

VNEG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 V
VCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VNEG 0.3 V to VCC + 0.3 V
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VNEG + 13.2 V
ILX (peak current ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 A
VOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V
Bypass, CS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VNEG 0.3 V to VCC +0.3 V
(VLX VCS ) internal power MOSFET . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 V
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 to 150
Operating Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150
Power Dissipation (Package)a
8-Pin SOIC (Y Suffix)b . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25 W
Thermal Impedance (JA)a
8-Pin SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 /W
Notes
a. Device mounted with all leads soldered or welded to PC board.
b. Derate 10 mW/ above 25.




Description

The Si9121 simplifies the 48-V to +5-V or +3.3-V converter design for ISDN application by integrating the floating feedback error amplifier providing direct output voltage regulation. This approach eliminates the need for an external shunt regulator. The Si9121 also integrates a high voltage depletion mode MOSFET which allows the converter to be powered directly from the high input bus voltage without requiring an external start-up circuit. Combined with simple magnetic design due to its non-isolated topology, the Si9121 provides a one-chip solution for complete ISDN power supply. In order to reduce external component count, the Si9121 has a fully integrated 95-kHz oscillator and soft-start circuit.

The Si9121 is available in SOIC-8 pin package, and is available in either +5-V or +3.3-V fixed output options (Si9121DY-5 or Si9121DY-3, respectively). In order to satisfy the stringent ambient temperature requirements in many applications, the Si9121 is rated to the industrial temperature range of 40C to 85 .






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