Datasheet ADP1071-1, ADP1071-2 (Analog Devices) - 5

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Data Sheet ADP1071-1 /ADP1071-2 Parameter Symbol Test Conditions/Comments Min Typ Max Unit
CURRENT-LIMIT SENSE (PRIMARY) CS Limit Threshold VCS_LIM Overcurrent sense limit threshold 120 mV CS Leading Edge 150 ns Blanking Time Current Source di/dt for Switching period (tS) = 1/fS 20 µA per tS Slope Compensation Overcurrent Protection 40 ns (OCP) Comparator Delay Time in OCP Before 1.5 ms Entering Hiccup Mode OCP Hiccup Time See the Input/Output Current-Limit 40 ms Protection section FB PIN AND ERROR AMPLIFIER Feedback Accuracy VFB TJ = −40°C to +85°C −0.85% +1.2 +0.85% V Voltage TJ = −40°C to +125°C −1.25% +1.2 +1.25% V Temperature 76 ppm/°C Coefficient FB Input Bias Current −100 1 +100 nA Transconductance gm 230 250 270 µS Output Current Clamp Minimum −57 µA Maximum 43 µA COMP Clamp Voltage Maximum 2.52 V Minimum 0.7 V Open-Loop Gain 80 dB Output Shunt Resistance 5 GΩ Gain Bandwidth Product 1 MHz PRECISION ENABLE THRESHOLD EN Threshold VEN EN rising 1.14 1.2 1.26 V EN Hysteresis VEN < 1.2 V 4 µA VEN > 1.2 V 1 µA EN Hysteresis Current 3 µA LIGHT LOAD MODE (ADP1071-1 ONLY) LLM Current Source Resistor from MODE to AGND1 5.5 6.5 7.5 µA TEMPERATURE Thermal Shutdown 155 °C Hysteresis −15 °C SOFT START Open Loop Soft Start tSS1 GATE resistor = 10 kΩ 16 × 775 tS Time on Primary GATE resistor = 22 kΩ 64 × 775 tS GATE resistor = 47 kΩ 256 × 775 tS GATE resistor = 100 kΩ 4 × 775 tS SS2 Current Source During startup 20 µA SS2 Discharging During a fault condition or soft stop 30 µA Current Rev. B | Page 5 of 27 Document Outline Features Applications Functional Block Diagram General Description Revision History Specifications Insulation and Safety Related Specifications Regulatory Information Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Theory of Operation Detailed Block Diagram Primary Side Supply, Input Voltage, and LDO Secondary Side Supply and LDO Precision Enable Soft Start Procedure Output Voltage Sensing and Feedback Loop Compensation and Steady State Operation Slope Compensation Input/Output Current-Limit Protection Temperature Sensing Frequency Setting (RT Pin) Maximum Duty Cycle Frequency Synchronization Synchronous Rectifier (SR) Driver Output Overvoltage Protection (OVP) SR Dead Time Light Load Mode (LLM) and Continuous Conduction Mode (CCM) Soft Stop OCP/Feedback Recovery Output Voltage Tracking Remote System Reset OCP Counter External Start-Up Circuit Insulation Lifetime Layout Guidelines Applications Information Typical Application Circuits Outline Dimensions Ordering Guide