USERS MANUAL ISL8560EVAL2Z AN1324 Rev 3.00 Evaluation Board February 13, 2008 The ISL8560 is a step down DC/DC power switching Features regulator which accepts a 9V to 60V input, and provides up Voltage feedforward to 2A of output current. The output voltage can be set between 1.21V and 35V by means of an external resistor Step down DC/DC supporting up to 2A divider. The device uses an internal power DMOS transistor Input voltage range of 9V to 60V with a typical r of 0.19 to obtain very high efficiency DS(ON) Internal reference of 1.21V 1% and high switching speed. A switching frequency in the range of 100kHz to 600kHz can be realized (the maximum Adjustable output voltage range of 1.21V to 35V power dissipation of the various packages must be Adjustable switching frequency 100kHz to 600kHz observed). Notable features of this next generation DC/DC converter include pulse-by-pulse current limit for FET Frequency SYNC pin protection, hiccup-mode short circuit protection, voltage Zero load current operation feedforward, frequency SYNC, soft-start, low standby current of 60A typical in the disabled state and thermal Pulse-by-pulse mode current limit shut-down. The device is available in a 20 Ld QFN package. Hiccup mode short-circuit protection Low standby current of 60A typical Ordering Information Thermal shut-down PART TEMP. NUMBER PART RANGE PACKAGE PKG. Transient survival up at 100V for 400ms (Note) MARKING (C) (Pb-free) DWG. Pb-free (RoHS compliant) ISL8560IRZ ISL 8560IRZ -40 to +85 20 Ld 6x6 QFN L20.6x6B ISL8560IRZ-T* ISL 8560IRZ -40 to +85 20 Ld 6x6 QFN L20.6x6B Applications ISL8560EVAL2Z Evaluation Board Industrial and automotive power supplies *Please refer to TB347 for details on reel specifications. Portable computers NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets molding compounds/die attach Battery chargers materials and 100% matte tin plate PLUS ANNEAL - e3 termination Distributed power systems finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed Related Literature the Pb-free requirements of IPC/JEDEC J STD-020. Technical Brief TB363 Guidelines for Handling and Processing Moisture Sensitive Surface Mount Devices (SMDs) Pinouts ISL8560 (20 LD QFN) TOP VIEW 20 19 18 17 16 LX 1 15 LX LX 2 14 SS BOOT 3 13 PGND 4 12 EN PGOOD 5 11 VCC5 REF 67 8 9 10 AN1324 Rev 3.00 Page 1 of 8 February 13, 2008 SYNC VIN RTCT VIN SGND VIN FB VIN COMP LXISL8560EVAL2Z Evaluating the Other Output Voltage Whats Inside The ISL8560EVAL2Z kit output is preset to 5V. The output The Evaluation Board Kit contains the following materials: voltage can be adjusted from 1.21V to 55V by Equation 1: The ISL8560EVAL2Z REVB board. (EQ. 1) R =R V V 1 1 2 OUT FB1 The ISL8560 datasheet. ISL8560 Evaluation Board Application Note. with R = 51.1k and V = 1.21V. FB1 2 Recommended Equipment Note: The inductor, output capacitors and the compensation network may need to be tweaked, along with the The following equipment is recommended to evaluate the corresponding compensation network, for optimal performance of the board: performance with change in output voltage and/or load. Also, 0V to 100V power supply with at least 5A current sourcing additional heatsinking or airflow may required to insure that capability. the junction temperature does not exceed +125C. Electronic Loads capable of sinking current up to 5A. Frequency Digital Multimeters (DMMs.) The ISL8560EVAL2Z kit is preset at 500kHz. The 100MHz quad-trace Oscilloscope. ISL8560EVAL2Z can be adjusted to operate at switching frequencies from 100kHz to 600kHz. Use C to program 16 Signal generator (to test the SYNC feature only). the switching frequency using Equation 2: 6.25 1000 Quick Setup Guide -------------------- ------------------------------ C nF = 0.3 (EQ. 2) 16 Rk f kHz 7 OSC 1. Ensure that the circuit is correctly connected to the supply and loads prior to applying any power. Synchronization 2. Connect the bias supply to VIN, with the positive terminal The ISL8560EVAL2Z circuit may be synchronized to a TTL connected to P1(VIN), and the return to P2(GND). signal that is set at a higher switching frequency than the 3. Connect the load across the output terminals, between pre-set frequency. The range of the external synchronizing pins P3 (positive) and P4 (return). frequency is from 100kHz to 600kHz. It is recommended to 4. Verify that the jumper JP1 is connected. use and RTCT capacitor (C ) of 2700pF in this 16 5. Apply a voltage between 9V and 60V across the input. configuration. 6. Verify that the output voltage is 5V. TABLE 1. SWITCH 1 SETTINGS JP1 ENABLE OPERATING MODE 1 OPEN Unit Disabled 2 GND Unit Enabled AN1324 Rev 3.00 Page 2 of 8 February 13, 2008