LM5080MM/NOPB National Semiconductor, LM5080MM/NOPB Datasheet
LM5080MM/NOPB
Specifications of LM5080MM/NOPB
LM5080MMTR
Available stocks
Related parts for LM5080MM/NOPB
LM5080MM/NOPB Summary of contents
Page 1
... LM5080 Typical Application © 2006 National Semiconductor Corporation Features n Average program current share method n Single-wire star link current share bus ...
Page 2
Connection Diagram Ordering Information Order Number LM5080MM LM5080MMX Pin Descriptions Pin Name 1 SHR Current Share Bus. The SHR pins of each LM5080 device are connected together. 2 CSM Current Sense Amplifier Minus Input. 3 TRO Transconductance Output. One of ...
Page 3
... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications GND CC RSO to GND (Note 2) All other pins to GND ESD Rating (Note 3) Human Body Model Electrical Characteristics the junction temperature range of –40˚C to +125˚C and are provided for reference only. Unless otherwise specified, the fol- lowing conditions apply: CSM = 0, VCC = 5V, RSO unloaded ...
Page 4
Electrical Characteristics the junction temperature range of –40˚C to +125˚C and are provided for reference only. Unless otherwise specified, the following conditions apply: CSM = 0, VCC = 5V, RSO unloaded. (Continued) Note 1: Absolute Maximum Ratings are limits beyond ...
Page 5
Typical Performance Characteristics RSO Buffer Input Offset Voltage vs VCC TRO Current Limit vs VCC CSP Input Open Circuit Voltage vs VCC (Continued) 20157821 TRO Offset Current vs TRO Voltage 20157823 CSP Mode Thresholds vs VCC 20157826 5 RSO VOL ...
Page 6
Block Diagram www.national.com 20157803 6 ...
Page 7
Operating Description Identical regulators connected in parallel will theoretically share the total load current equally. However, slight mis- matches in the reference voltage or feedback dividers of each regulator can cause significant imbalances in the load current sharing. The LM5080 ...
Page 8
Reference Adjustment Operation Mode (Continued) voltage reference and feedback divider which do not require a fast response. In some systems a small resistor (RTRO) in series with CTRO can improve stability by introducing a zero at high frequencies to increase ...
Page 9
Remote Sense Adjust Modes The two remote sense adjust modes (positive and negative) achieve current sharing by controlling either remote sense input of the power converter. These configurations for the LM5080 are shown in Figures 3 and 4. To understand ...
Page 10
Remote Sense Adjust Modes FIGURE 4. Remote Sense Positive Mode Implementation Feedback Adjustment Mode The feedback adjust mode configuration is shown in Figure very similar to the reference adjust mode except the current sensing is done on ...
Page 11
Voltage Margining Shifting the output regulation voltage up or down by a small amount is referred to as voltage margining. In the remote sense adjust modes and the feedback adjust modes, this can be done by connecting all of the ...
Page 12
General Design Procedure 1. Select an appropriate sense resistor value. More sense voltage will result in better load sharing but more effi- ciency loss. Sense voltages of 50mV or more are rec- ommended. In addition, the sense voltage at full ...
Page 13
... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...