TS1102 Current-Sense Amplifier Demo Board FEATURES RSENSE: 50m 0.5% Fully Assembled and Tested 2in x 2in 2-layer circuit board COMPONENT LIST DESIGNATION C2 QTY 1 R1 1 U1 1 VBATT, VOUT, LOAD 3 DESCRIPTION 47nF 10% capacitor (0805) 50m 0.5% (0805) TS1102-25DB/ TS1102-50DB/ TS1102-100DB/ TS1102-200DB Test points DESCRIPTION The demo board for the TS1102 is a completely assembled and tested circuit board that can be used for evaluating the current-sense amplifier for all (4) gain options; i.e., 25V/V, 50V/V, 100V/V, and 200V/V. The board is configured with an RSENSE =R1=50m resistor. The board has a dedicated RS+=VBATT, RS-=LOAD, and output voltage OUT=VOUT test points. For additional information, refer to the TS1102 product data sheet. All TS1102s are available in a PCB-space saving 5-lead SOT23 surface-mount package. Product data sheets and additional documentation can be found at www.silabs.com. ORDERING INFORMATION Order Number TS1102-25DB TS1102-50DB TS1102-100DB TS1102-200DB Figure 1. TS1102 current-sense amplifier circuit Description TS1102-XXX Demo Board Figure 2. TS1102 Demo Board Page 1 (c) 2014 Silicon Laboratories, Inc. All rights reserved. TS1102 Current-Sense Amplifier Demo Board DESCRIPTION The demo board includes an on-board 47nF capacitor at the VOUT output pin. Depending on the load current desired, an external resistor or active load is to be connected to the LOAD pin. QUICK START PROCEDURE Required Equipment TS1102 demo board A DC Power Supply, an HP Model HP6624A or equivalent Two digital voltmeters Load resistor or an active load (value varies depending on ILOAD desired) Signal Eval board VBATT RS+ LOAD RSVOUT OUT GND GND Table 1. Demo board test points MAX VSENSE (mV) 25 6 1600 3.75 2 80 50 6 800 7.5 2 40 100 6 400 15 2 20 200 6 200 30 2 10 Table 2. Demo board test set-up per gain setting VBATT (V) ILOAD (mA) RLOAD () 5) Based on the selected gain option of the current sense amplifier, select the load resistor or an active load according to Table 2. Connect one end of this resistor or active load to the pad labeled LOAD and the other end to the adjacent pad labeled GND_L. 6) Turn on the power supply and observe the output voltage at VOUT. The expression for the TS1102's output voltage is given by: GAIN (V/V) negative terminal to the adjacent test point labeled GND. VOUT (V) VOUT = ILOAD x 50m x ROUT/R1 where the TS1102's internal ROUT and R1 resistor values are listed in Table 3. GAIN(V/V) R1 () ROUT () 25 400 10k 50 200 10k 100 100 10k 200 100 20k Table 3. TS1102's Internal Gain Setting Resistors (typical values) 7) The TS1102's actual output voltage VOUT will depend on the TS1102's actual offset voltage VOS, its gain error GE, sense resistor (RSENSE) tolerance of 1%, and the load resistor tolerance/active load accuracy. To evaluate the TS1102 current-sense amplifier circuit, the following steps are to be performed: 1) Before connecting the DC power supply to the demo board, turn on the power supply, set the DC voltage to 6V, set its short circuit current limit to 10% higher than the maximum load current in the application, and then turn it off. 2) Connect the DC power supply positive terminal to the pad labeled VBATT and its negative terminal to the adjacent pad labeled GND. 3) Connect a digital voltmeter to the test points labeled TP+ and TP- to measure VSENSE. 4) Connect the positive terminal of a second digital voltmeter to the test point labeled VOUT and the Page 2 TS1102-EVB Rev. 1.0 TS1102 Current-Sense Amplifier Demo Board Figure 3. Top Layer Component View Figure 4. Top Layer Trace View Figure 5. Bottom Layer (GND) Silicon Laboratories, Inc. 400 West Cesar Chavez, Austin, TX 78701 +1 (512) 416-8500 www.silabs.com Page 3 TS1102-EVB Rev. 1.0 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Silicon Laboratories: TS1102-50DB TS1102-25DB TS1102-200DB TS1102-100DB