DC536B-A Analog Devices

DEMO MANUAL DC536B LTC4211 Hot Swap Controller with Multifunction Current Control Description Demonstration circuit 536B is a hot swap controller with The DC536B updates obsoleted components (Q1, D1) in multifunction current control featuring the LTC 4211. The DC536A. DC536B-A is configured to operate with up to 7A load and Design files for this circuit board are available at DC536B-B up to 20A load. DEMO MANUAL DC536B Quick s tart p D DC536B is easy to set up to evaluate the performance of 6. After any necessary component changes have been the LTC4211. Refer to Figure 1 for proper measurement made, connect a suitable load between VOUT and equipment setup and follow the procedure below: GND. This may be a passive resistive load or an active electronic load box. 1. The DC536B is set up to operate in a 5V system. If the LTC4211 is to be evaluated at a different operating 7. Connect a power supply capable of supplying 1.5I LOAD condition, follow steps 2 to 5 below, otherwise skip to between the VIN and GND turrets. The minimum cur- step 6. rent capability of the supply must accommodate the tolerance of the circuit breaker threshold of 20%. With 2. If evaluating at a voltage other than 5V, R3 must the 7m factory installed sense resistor, the overload be adjusted for proper RESET response. Select circuit breaker will trip at between 5.7A to 8.5A (7A R3=V 15k/1.22315k, where V is the mini- MIN MIN nominal). Connect the ON/OFF turret to the VIN turret mum output voltage expected for normal operation. to enable power to the load. A function generator can 3. The ON pin operates as an input of a precision com- be used to generate a single event and trigger a scope. parator and can accurately provide an adjustable un- The DC536B provides convenient turrets for observing dervoltage lockout. The DC536B is initially configured the FAULT, RESET and VOUT signals. to turn on at 4.15V . If 3.3V logic will drive this pin, MIN 8. The following experiments can be run: R1 can be replaced with a short. If the ON pin will be used to provide undervoltage lockout, then select R1 Turn on into a nominal load such that R1=V 10k/1.3910k, where V is UVLO UVLO Turn on into an overload the minimum turn on voltage. Refer to the data sheet Turn on into a short circuit Figure 3 for common configurations. Turn on into a nominal load and increase the load 4. For evaluating a circuit with up to 20A load, use until the LTC4211 trips off. DC536B-B board. A digital storage scope provides a convenient means of 5. The soft start and power good (RESET release) delay observing the turn on and overload event. Observe the is factory set to 2.9ms. This delay can be adjusted by input or output current using a current probe. A current changing C refer to the data sheet Table 1 for TIMER transformer can be used to observe the turn on current common values and the System Timing section for transients if a current probe is not available. more detailed information. CURRENT PROBE + + LOAD GND CH2 CH1 EXT TRIGGER OSCILLOSCOPE DC536 F01 Figure 1. Proper Measurement Equipment Setup dc536bf 2 ure roce