QUICK START GUIDE FOR DC1394A PMIC High Voltage Adaptor Board With 5V Adaptor Inputs DESCRIPTION Demonstration Circuit 1394A is a 38V, 2A, 2.4MHz Step-Down Switching Regulator with 70μA Quiescent Current. The LT3480EDD is available in a 10-pin (3mm × 3mm) DFN surface mount package. L, LTC, LTM, LT, Burst Mode, OPTI-LOOP, Over-The-Top and PolyPhase are registered trademarks of Linear Technology Corporation. Adaptive Power, C-Load, DirectSense, Easy Drive, FilterCAD, Hot Swap, LinearView, μModule, Micropower SwitcherCAD, Multimode Dimming, No Latency ΔΣ, No Latency Delta-Sigma, No RSENSE, Operational Filter, PanelProtect, PowerPath, PowerSOT, SmartStart, SoftSpan, Stage Shedding, SwitcherCAD, ThinSOT, UltraFast and VLDO are trademarks of Linear Technology Corporation. Other product names may be trademarks of the companies that manufacture the products. PERFORMANCE SUMMARY Specifications are at TA = 25°C SYMBOL HVIN 5V ADAPTOR HVBUCK IHVBUCK PARAMETER High Voltage Input Voltage Range 5V Adaptor Input Voltage Range Output Voltage Range Output Current CONDITIONS Input disabled from 38-60V Range is mode and load dependant QUICK START PROCEDURE Using short twisted pair leads for any power connections, with all loads and power supplies off, refer to Figures 1 & 2 for the proper measurement and equipment setup. A companion PMIC demo board is required for this check out procedure. The DC1303A (LTC4098EPDC) board is recommended, and will be used for the following procedure. Please refer to the DC1303A Quick Start Guide for further information. Follow the procedure below: 1. Set PS1 to 8V, PS2 to 0V, and PS3 to 3.6V. Set Load1 to 0A. Ensure that jumpers are configured as per Figure 1, except the “D2” jumper (JP3) on the DC1303A should be set to “1”. 2. Observe that 4.60V < VOUT (VM3) < 4.80V. The LT3480 HV Buck regulator is running with its control loop closed locally. The nominal HVBUCK voltage is 4.75V, and the LTC4098EPDC on the DC1303A board has connected HVBUCK to VOUT. 1 MIN 8 4.5 3.5 TYP MAX 60 5.5 5.5 2 UNITS V V V A 3. Set Load1 to 2A. Observe that 4.60V < VOUT (VM3) 4.80V. Set Load1 to 0A. The 2A load on VOUT loads HVBUCK, so the LT3480EDD is supplying 2A. 4. Set PS1 to 38V. Observe that 4.60V < VOUT (VM3) < 4.80V. The LT3480 is designed to operate from HVIN = 8V to 38V. 5. Set Load1 to 2A. Observe that 4.60V < VOUT (VM3) < 4.80V. Set Load1 to 0A. The LT3480 is now supplying 2A, while operating from 38V. 6. Set “COMP” jumper (JP2) to “REMOTE”. Observe that 3.80V < VOUT (VM3) < 4.10V. The LTC4098EPDC is now controlling the LT3480 output voltage to approximately V(BAT) + 0.3V. 7. Set Load1 to 2A. Observe that 3.80V < VOUT (VM3) < 4.10V. Set Load1 to 0A. LT3480 is supplying 2A, while under LTC4098 control. 8. Set PS1 to 8V. Observe that 3.80V < VOUT (VM3) < 4.10V. 9. Set Load1 to 2A. Observe that 3.80V < (VM3) < 4.10V. Set Load1 to 0A. 10. Set PS2 to 4.5V, and “WALL” jumper (JP3) to “5V ADAPTOR”. Observe that 4.40 < VOUT (VM3) < 4.50V. The LT3480 is not supplying power to VOUT. This verifies that the LTC4098 recognizes the 5V Adapator input, and connects it to VOUT. 11. Set Load1 to 1A. Observe that 4.40V < VOUT (VM3) < 4.50V. Set Load1 to 0A. 12. Set PS2 to 5.5V. Observe that 5.40V < VOUT (VM3) < 5.50V. 13. Set Load1 to 1A. Observe that 5.40V < VOUT (VM3) < 5.50V. 2 - + PS1 + 0V-40V supply 1A - VM1 - + PS2 + 0V-6V supply 2A - + AM1 AM2 + VM2 - D2 D1 D0 AM3 - + + + VM3 - - Load1 0V-5V 5A AM4 + - + VM4 - 3.6Ω + - Note: All connections from equipment should be Kelvin connected directly to the Board PINS which they are connected to on this diagram and any input, or output, leads should be twisted pair Figure 1. Proper Measurement Equipment Setup for DC1394A GND VIN Figure 2. Measuring Input or Output Ripple 3 PS3 0V-5V supply 2A Figure 3. DC1394A Schematic HVIN E1 GND 4.5V - 5.5V 5V ADAPTOR GND E2 E4 E3 R3 1 5% C3 10 0603 6.3V C2 0.068uF 50V 0603 BURST PWM/SYNC JP1 SYNC R1 150k R2 40.2k 8 10 6 5 FB RT SYNC RUN/SS LT3480EDD U1 4 11 GND VIN Unless noted: Resistors: Ohms 0402 1% 1/16W Capacitors: uF 0402 10% 25V C1 4.7uF 50V 1206 BD Vc PG SW BOOST 9 7 3 2 1 REMOTE LOCAL C4 330pF R4 20k NR6045T6R3M L1 6.3uH C5 VALUE OPT C6 VALUE OPT TP1 Note: * Move JP2 to REMOTE when connected to PMIC board. JP2 COMP D1 DFLS240L 40V 2A C8 0.47uF 25V 0603 1 2 8V - 38V R5 100k R6 499k R7 20 5% C7 22uF 0805 6.3V HV BUCK R8 10k 5% 5V ADAPTOR JP3 WALL 1 3 2 4 VOUT VC/TRACK VOUT GND ACPR GND PG WALL SYNC SHDN DVCC ILIM SDA HVOK/INIT SCL HVIN J1 2A TSH-108-01-T-RA 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 GND HV BUCK INTERFACE Q1 Si2333DS E5 HVBUCK 3.7V - 4.7V E6 Figure 4. DC1394A BOM 5