Datasheet ADP1872, ADP1873 (Analog Devices) - 2
| 制造商 | Analog Devices |
| 描述 | Synchronous Current-Mode with Constant On-Time, PWM Buck Controller |
| 页数 / 页 | 40 / 2 — ADP1872/ADP1873. Data Sheet. TABLE OF CONTENTS. REVISION HISTORY. … |
| 修订版 | B |
| 文件格式/大小 | PDF / 1.7 Mb |
| 文件语言 | 英语 |
ADP1872/ADP1873. Data Sheet. TABLE OF CONTENTS. REVISION HISTORY. 7/12—Rev. A to Rev. B. 3/10—Rev. 0 to Rev. A
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ADP1872/ADP1873 Data Sheet TABLE OF CONTENTS
Features .. 1 Timer Operation .. 21 Applications ... 1 Pseudo-Fixed Frequency ... 22 Typical Applications Circuit .. 1 Applications Information .. 23 General Description ... 1 Feedback Resistor Divider .. 23 Revision History ... 2 Inductor Selection .. 23 Specifications ... 3 Output Ripple Voltage (ΔVRR) .. 23 Absolute Maximum Ratings .. 5 Output Capacitor Selection ... 23 Thermal Resistance .. 5 Compensation Network .. 24 Boundary Condition .. 5 Efficiency Consideration ... 25 ESD Caution .. 5 Input Capacitor Selection .. 26 Pin Configuration and Function Descriptions ... 6 Thermal Considerations .. 27 Typical Performance Characteristics ... 7 Design Example .. 27 ADP1872/ADP1873 Block Digram .. 17 External Component Recommendations .. 30 Theory of Operation .. 18 Layout Considerations ... 32 Startup .. 18 IC Section (Left Side of Evaluation Board) ... 37 Soft Start .. 18 Power Section ... 37 Precision Enable Circuitry .. 18 Differential Sensing .. 37 Undervoltage Lockout ... 18 Typical Application Circuits ... 38 Thermal Shutdown ... 18 Dual-Input, 300 kHz High Current Application Circuit .. 38 Programming Resistor (RES) Detect Circuit .. 19 Single-Input, 600 kHz Application Circuit ... 38 Valley Current-Limit Setting .. 19 Dual-Input, 300 kHz High Current Application Circuit .. 39 Hiccup Mode During Short Circuit ... 20 Outline Dimensions ... 40 Synchronous Rectifier .. 21 Ordering Guide .. 40 Power Saving Mode (PSM) Version (ADP1873) .. 21
REVISION HISTORY 7/12—Rev. A to Rev. B
Changes to Table 9 .. 31 Changed R Changes to Figure 82 .. 32 ON = 15 mΩ/100 kΩ Valley Current Level Value from 7.5 to 3.87; Table 6 .. 20 Changes to Figure 83 .. 33 Changes to Ordering Guide .. 40 Changes to Figure 84 .. 34 Changes to Figure 85 .. 35
3/10—Rev. 0 to Rev. A
Changes to Figure 86 .. 36 Changes to Figure 1 .. 1 Changes to Differential Sensing Section and Figure 88 .. 37 Changes to Table 1 .. 3 Changes to Figure 89 and Figure 90... 38 Changes to Table 2 .. 5 Changes to Figure 91 .. 39 Changes to Figure 59 Caption and Figure 60 Caption .. 16 Updated Outline Dimensions ... 40 Changes to Figure 64 .. 17
10/09—Revision 0: Initial Version
Changes to Timer Operation Section .. 22 Changes to Table 7 .. 23 Changes to Inductor Section ... 28 Rev. B | Page 2 of 40 Document Outline Features Applications Typical Applications Circuit General Description Revision History Specifications Absolute Maximum Ratings Thermal Resistance Boundary Condition ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics ADP1872/ADP1873 Block Digram Theory of Operation Startup Soft Start Precision Enable Circuitry Undervoltage Lockout Thermal Shutdown Programming Resistor (RES) Detect Circuit Valley Current-Limit Setting Hiccup Mode During Short Circuit Synchronous Rectifier Power Saving Mode (PSM) Version (ADP1873) Timer Operation Pseudo-Fixed Frequency Applications Information Feedback Resistor Divider Inductor Selection Output Ripple Voltage (ΔVRR) Output Capacitor Selection Compensation Network Output Filter Impedance (ZFILT) Error Amplifier Output Impedance (ZCOMP) Error Amplifier Gain (GM) Current-Sense Loop Gain (GCS) Crossover Frequency Efficiency Consideration Channel Conduction Loss MOSFET Driver Loss MOSFET Switching Loss Body Diode Conduction Loss Inductor Loss Input Capacitor Selection Thermal Considerations Design Example Input Capacitor Inductor Current Limit Programming Output Capacitor Feedback Resistor Network Setup Compensation Network Loss Calculations External Component Recommendations Layout Considerations IC Section (Left Side of Evaluation Board) Power Section Differential Sensing Typical Application Circuits Dual-Input, 300 kHz High Current Application Circuit Single-Input, 600 kHz Application Circuit Dual-Input, 300 kHz High Current Application Circuit Outline Dimensions Ordering Guide
ADP1872/ADP1873 Data Sheet TABLE OF CONTENTS
Features .. 1 Timer Operation .. 21 Applications ... 1 Pseudo-Fixed Frequency ... 22 Typical Applications Circuit .. 1 Applications Information .. 23 General Description ... 1 Feedback Resistor Divider .. 23 Revision History ... 2 Inductor Selection .. 23 Specifications ... 3 Output Ripple Voltage (ΔVRR) .. 23 Absolute Maximum Ratings .. 5 Output Capacitor Selection ... 23 Thermal Resistance .. 5 Compensation Network .. 24 Boundary Condition .. 5 Efficiency Consideration ... 25 ESD Caution .. 5 Input Capacitor Selection .. 26 Pin Configuration and Function Descriptions ... 6 Thermal Considerations .. 27 Typical Performance Characteristics ... 7 Design Example .. 27 ADP1872/ADP1873 Block Digram .. 17 External Component Recommendations .. 30 Theory of Operation .. 18 Layout Considerations ... 32 Startup .. 18 IC Section (Left Side of Evaluation Board) ... 37 Soft Start .. 18 Power Section ... 37 Precision Enable Circuitry .. 18 Differential Sensing .. 37 Undervoltage Lockout ... 18 Typical Application Circuits ... 38 Thermal Shutdown ... 18 Dual-Input, 300 kHz High Current Application Circuit .. 38 Programming Resistor (RES) Detect Circuit .. 19 Single-Input, 600 kHz Application Circuit ... 38 Valley Current-Limit Setting .. 19 Dual-Input, 300 kHz High Current Application Circuit .. 39 Hiccup Mode During Short Circuit ... 20 Outline Dimensions ... 40 Synchronous Rectifier .. 21 Ordering Guide .. 40 Power Saving Mode (PSM) Version (ADP1873) .. 21
REVISION HISTORY 7/12—Rev. A to Rev. B
Changes to Table 9 .. 31 Changed R Changes to Figure 82 .. 32 ON = 15 mΩ/100 kΩ Valley Current Level Value from 7.5 to 3.87; Table 6 .. 20 Changes to Figure 83 .. 33 Changes to Ordering Guide .. 40 Changes to Figure 84 .. 34 Changes to Figure 85 .. 35
3/10—Rev. 0 to Rev. A
Changes to Figure 86 .. 36 Changes to Figure 1 .. 1 Changes to Differential Sensing Section and Figure 88 .. 37 Changes to Table 1 .. 3 Changes to Figure 89 and Figure 90... 38 Changes to Table 2 .. 5 Changes to Figure 91 .. 39 Changes to Figure 59 Caption and Figure 60 Caption .. 16 Updated Outline Dimensions ... 40 Changes to Figure 64 .. 17
10/09—Revision 0: Initial Version
Changes to Timer Operation Section .. 22 Changes to Table 7 .. 23 Changes to Inductor Section ... 28 Rev. B | Page 2 of 40 Document Outline Features Applications Typical Applications Circuit General Description Revision History Specifications Absolute Maximum Ratings Thermal Resistance Boundary Condition ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics ADP1872/ADP1873 Block Digram Theory of Operation Startup Soft Start Precision Enable Circuitry Undervoltage Lockout Thermal Shutdown Programming Resistor (RES) Detect Circuit Valley Current-Limit Setting Hiccup Mode During Short Circuit Synchronous Rectifier Power Saving Mode (PSM) Version (ADP1873) Timer Operation Pseudo-Fixed Frequency Applications Information Feedback Resistor Divider Inductor Selection Output Ripple Voltage (ΔVRR) Output Capacitor Selection Compensation Network Output Filter Impedance (ZFILT) Error Amplifier Output Impedance (ZCOMP) Error Amplifier Gain (GM) Current-Sense Loop Gain (GCS) Crossover Frequency Efficiency Consideration Channel Conduction Loss MOSFET Driver Loss MOSFET Switching Loss Body Diode Conduction Loss Inductor Loss Input Capacitor Selection Thermal Considerations Design Example Input Capacitor Inductor Current Limit Programming Output Capacitor Feedback Resistor Network Setup Compensation Network Loss Calculations External Component Recommendations Layout Considerations IC Section (Left Side of Evaluation Board) Power Section Differential Sensing Typical Application Circuits Dual-Input, 300 kHz High Current Application Circuit Single-Input, 600 kHz Application Circuit Dual-Input, 300 kHz High Current Application Circuit Outline Dimensions Ordering Guide