DEMO MANUAL DC2307A LT1910 Protected High Side MOSFET Driver Description Demonstration circuit 2307A is a high input voltage pro- The setup for DC2307A evaluation is shown in Figure 1. tected high side MOSFET driver featuring the LT 1910ES8. Sync pulses can be applied to terminals E4 (SYNC) E5 This demo board has a wide input voltage range from (GND) for synchronization to an external clock. In this 8V to 48V and is capable of protecting a voltage source case, the DC2307A supports a low bandwidth PWM. Figure against a short circuit. 2 illustrates functionality of such solution with 100Hz switching frequency. Figure 3 shows the waveforms of This demo board uses an installed 2.43k load resistor the high side switch driver during a short-circuit with to demonstrate the functionality of the LT1910 in a stand- automatic restart. alone mode without external loads. An additional resistive load can be connected to the terminals E6 (VOUT) and The LT1910 has a 50mV trip point for the selection of the E7 (GND). The DC2307A is setup to switch pure resistive current sense resistor RS1. The current sense resistor RS1 loads. If there is a need for verification to switch capaci- installed on the board is 0.1, 1206 package. However, the tive loads, then optional circuitry can be installed using RS1 footprint supports multiple sizes from 0805 to 2512. C LOAD capacitor and R7. The ability to switch inductive However, the RS1 footprint supports multiple sizes and loads can also be verified by placing an inductive load over can be replaced with up to a 2W device. The LT1910 data the C LOAD footprint and using diode D4 for dissipating sheet gives a complete description of this part, operation inductive energy at turn-off of the MOSFET switch Q2. and application information and must be read in conjunc- tion with this demo manual. The DC2307A supports two types of short-circuit protec- tion: one with automatic restart and the other with automatic Design files for this circuit board are available at restart defeat. The DC2307A is set up for automatic restart DEMO MANUAL DC2307A Quick s tart p D Demonstration circuit 2307A is easy to set up to evaluate position. Measure VOUT it should read 20V. Vary VIN the performance of the LT1910. Set up the circuit accord- in the available range, and measure the corresponding ing to the diagram in Figure 1. VOUT. (Do not apply more than the rated maximum volt- age of 48V to the board or the part may be damaged). Before proceeding to test, insert a shunt in header JP1, (RUN) into OFF position, which connects the RUN pins to 3. Repeat turning on and off LTC1910, by inserting the ground (GND), and thus, shuts down the output. shunt in header JP1 (RUN), and measure VIN and VOUT. 1. With the DC2307A set up according to the proper mea- 4. For verification of the ability of LT1910 to be synced surement and equipment as shown in Figure 1, apply with an external clock, remove the shunt from JP1 20V at E1 (VIN). Measure VOUT it should read 0V. (RUN) header and apply a low bandwidth sync signal to terminals E4 (SYNC) E5 (GND). (Do not apply frequen- 2. Turn on the protected high side MOSFET driver by cies greater than 1kHz.) inserting the shunt in header JP1 (RUN) into the ON Figure 1. Proper Measurement Equipment Setup dc2307afa 2 ure roce