SMH4814
SMH4814 is Dual Feed Active-ORing Programmable Hot Swap Controller manufactured by Summit Microelectronics.
URES AND APPLICATIONS
Eliminates Passive ORing Diodes for Reduced Power Consumption High Noise Immunity on All Logic Inputs Soft Starts Main Power Supply on Card Insertion or System Power Up with Slew Rate Control Programmable Differential Current Sense Programmable Inrush Current Limiting Master Enable to Allow System Control of Power-Up or -Down Programmable Independent Enabling of up to 4 DC/DC Converters Programmable Circuit Breaker Level and Mode Programmable Quick-Trip™ Value, Current Limiting, Duty Cycle Times, Over-Current Filter Programmable Host Voltage Fault Monitoring Programmable UV/OV Filter and Hysteresis Programmable Fault Mode: Latched or Duty Cycle Internal Shunt Regulator Allows for a Wide Supply Range
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Applications
Tele Hot-Swap Card
- Advanced TCATM Network Processors Power-on Ethernet, IEEE 802.3af
SIMPLIFIED APPLICATIONS DRAWING
- 48V Ret.
I2C RD VIN+ V12 Pin Detect SDA SCL FBB FBC PD1 UV OV FBD FBA PUPA PUPB PUPC DRAIN SENSE PUPD VOUT+ DC-to-DC Converter A ON/OFF VINVOUT-
CBSENSE FEEDA FEEDB VGATEA VGATEB VGATE_HS
VSS Pin Detect RA PD0
A d va n c e d T C A
RS RB Primary Secondary
- 48V A
- 48V B
Figure 1. The SMH4814 Controller hot-swaps and cascade sequences up to 4 DC/DC Converters and actively controls the A and B
- 48V feeds eliminating the need for ORing diodes and the associated voltage drop.
Note: This is an applications example only. Some pins, ponents and values are not shown. © SUMMIT Microelectronics, Inc. 2005
- 1717 Fox Drive
- San Jose CA 95131
- Phone 408 436-9890
- FAX 408 436-9897 The Summit Web Site can be accessed by “right” or “left”...
