LM5067EVAL National Semiconductor, LM5067EVAL Datasheet
LM5067EVAL
Specifications of LM5067EVAL
Related parts for LM5067EVAL
LM5067EVAL Summary of contents
Page 1
... LM5067 Evaluation Board Introduction The LM5067EVAL evaluation board provides the design en- gineer with a fully functional hot swap controller board de- signed for negative voltage systems. This board contains an LM5067-2, the auto restart version of this IC. This application note describes the various functions of the board, how to test & ...
Page 2
Theory of Operation The LM5067 provides intelligent control of the power supply connections of a load which connected to a live power source. The two primary functions of a hot swap circuit are in- rush current limiting ...
Page 3
V , and can be higher or EE lower than system ground. The UVLO and OVLO thresholds are set by resistors R1-R3. The UVLO and OVLO thresholds are reached when the volt- FIGURE 3. ...
Page 4
Circuit Parameter Changes Current Limit The current limit threshold is set by R9 according to the fol- lowing equation mV/R9 LIM If the load current increases such that the voltage across R9 reaches 50 mV, the LM5067 ...
Page 5
UVLO/OVLO Input Voltage Thresholds As supplied, the input voltage UVLO thresholds on this eval- uation board are approximately 34.5V increasing, and 32.4V decreasing. The OVLO thresholds are approximately 77.7V increasing, and 75.6V decreasing. The four thresholds are determined by resistors ...
Page 6
... The companion Hot-Swap IC, the LM5067-1, latches off after a fault detection, with external control required for restart. . PGOOD is IN Restart is accomplished by momentarily taking the UVLO pin within 2.5V of VEE removing and re-applying the input voltage at VIN. Contact the nearest National Semiconductor sales office to obtain samples of the LM5067-1. 6 ...
Page 7
Performance Characteristics Horizontal Resolution: 200 ms/div Trace 2: TIMER Pin, 2V/div Trace 1: Vin, 50V/div (shown inverted 0 to -48V 2.2 µF Voltages are respect to VEE Horizontal Resolution: 0.5 ms/div Trace 4: Input Current, 2A/div Trace 2: ...
Page 8
Horizontal Resolution: 5 ms/div Trace 4: Input Current, 2A/div Trace 2: PGD Pin, 50V/div Trace 1: Vout, 20V/div Vin = -36V Voltages are respect to VEE Horizontal Resolution: 20 ms/div Trace 4: Load Current 0 to 5A, 2A/div Trace 2: ...
Page 9
Horizontal Resolution: 2sec/div Trace 2: TIMER Pin, 2V/div Trace 1 Vout, 20V/div Vin = -48V 2.2 µF Voltages are respect to VEE 30038821 FIGURE 11. Restart Timing 9 www.national.com ...
Page 10
Bill of Materials Item Description C1, C5 Ceramic Capacitor C3 Alum. Electrolytic Capacitor C8 Ceramic Capacitor C6 Unpopulated C2 Ceramic Capacitor Q1 N-Channel MOSFET R1 Resistor R2 Resistor R3 Resistor R4 Unpopulated R5 Resistor R6 Resistor R7 Resistor ...
Page 11
PC Board Layout Board Silkscreen Board Top Layer Board Bottom Layer (viewed from top) 11 30038824 30038825 30038826 www.national.com ...
Page 12
... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...