Datasheet ADP1032 (Analog Devices) - 4

ADP1032 Data Sheet Parameter Symbol Min Typ Max Unit Test Conditions/Comments
POWER GOOD Power-Good Threshold Flyback Regulator Lower Limit VPG_FLYBACK_LL 87.5 90 92.5 % Fixed and adjustable output versions Upper Limit VPG_FYLBACK_UL 107.5 110 112.5 % Fixed and adjustable output versions Buck Regulator Lower Limit VPG_BUCK_LL 87.5 90 92.5 % Upper Limit VPG_BUCK_UL 107.5 110 112.5 % Glitch Rejection 1.36 µs Glitch of ±15% of the typical output Output Voltage Logic High VPWRGD_OH VMVDD − 0.4 V PWRGD current (IPWRGD) = −1 mA Logic Low VPWRGD_OL 0.4 V IPWRGD = 1 mA SLEW Voltage Level Threshold Slow Slew Rate 0.8 V Normal Slew Rate 2 V Input Current Slow Slew Rate −10 µA Slew voltage (VSLEW) = 0 V to 0.8 V Normal Slew Rate 10 µA VSLEW = 2 V to VINP Fast Slew Rate −1 +1 µA SLEW pin not connected CLOCK SYNCHRONIZATION SYNC Input Input Clock Range fSYNC 350 750 kHz Minimum On Pulse Width tSYNC_MIN_ON 100 ns Minimum Off Pulse Width tSYNC_MIN_OFF 150 ns High Logic VH (SYNC) 1.3 V Low Logic VL (SYNC) 0.4 V Leakage Current −1 +0.005 +1 µA SYNC voltage (VSYNC) = VSVDDx FLYBACK REGULATOR Output Voltage Range VOUT1 (ADJ) 6 28 V ADP1032ACPZ-1, ADP1032ACPZ-2, and ADP1032ACPZ-3 VOUT1 (FIXED) 24 V ADP1032ACPZ-4 and ADP1032ACPZ-5 Output Voltage Accuracy −1.5 1.5 % Fixed output options Feedback Voltage VFB1 0.8 V Feedback Voltage Accuracy −1.5 +1.5 % Adjustable output options Feedback Bias Current IFB1 0.05 µA Load Regulation (ΔVFB1/VFB1)/ −0.0005 %/mA IOUT1 = 4 mA to 100 mA, IOUT2 = 30 mA ΔIOUT1 Line Regulation (ΔVOUT1/VOUT1)/ 0.0002 %/V VINP = 18 V to 32 V, IOUT1 = 80 mA, ΔVINP IOUT2 = 10 mA Power Field Effect Transistor RON (FLYBACK) 3 Ω SWP current (ISWP) = 100 mA (FET) On Resistance Current-Limit Threshold ILIM (FLYBACK) 400 440 480 mA SWP Leakage Current 0.03 0.5 µA SWP voltage (VSWP) = 60 V SWP Capacitance CSWP 50 pF Switching Frequency fSW (FLYBACK) 235 250 265 kHz SYNC = low or high fSYNC/2 kHz SYNC = external clock Minimum On Time 425 ns Minimum Off Time 220 ns Soft Start Timer tSS (FLYBACK) 8 ms Severe Overvoltage Threshold SOVPFLYBACK 29.4 30 30.6 V Flyback regulator stops switching until the overvoltage is removed Severe Overvoltage Hysteresis SOVPFLYBACK_HYST 500 mV Rev. 0 | Page 4 of 37 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL APPLICATION CIRCUIT COMPANION PRODUCTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS REGULATORY INFORMATION ELECTROMAGNECTIC COMPATIBILITY INSULATION AND SAFETY RELATED SPECIFICATIONS DIN V VDE 0884-10 (VDE V 0884-10) INSULATION CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION FLYBACK REGULATOR Flyback Regulator Operation Power Saving Mode (PSM) Flyback Undervoltage Lockout (UVLO) Flyback Regulator Precision Enable Control Flyback Regulator Soft Start Flyback Slew Rate Control Flyback Regulator Overcurrent Protection Flyback Regulator Overvoltage Protection BUCK REGULATOR Buck Regulator Operation Buck Regulator UVLO Buck Regulator Soft Start Buck Regulator Current-Limit Protection Buck Regulator Active Pull-Down Resistor Buck Regulator OVP POWER GOOD POWER-UP SEQUENCE OSCILLATOR AND SYNCHRONIZATION THERMAL SHUTDOWN DATA ISOLATION High Speed SPI Channels GPIO Data Channels APPLICATIONS INFORMATION COMPONENT SELECTION Feedback Resistors Capacitor Selection FLYBACK REGULATOR COMPONENTS SELECTION Input Capacitor Output Capacitor Ripple Current vs. Capacitor Value Schottky Diode Transformer Turn Ratio Primary Inductance Flyback Transformer Saturation Current Series Winding Resistance Leakage Inductance and Clamping Circuits Clamping Resistor Clamping Capacitor Clamping Diode Diode, Zener Diode Clamp Ripple Current (IAC) vs. Inductance Maximum Output Current Calculation BUCK REGULATOR COMPONENTS SELECTION Inductor Output Capacitor INSULATION LIFETIME Surface Tracking Insulation Wear Out Calculation and Use of Parameters Example THERMAL ANALYSIS TYPICAL APPLICATION CIRCUIT PCB LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE