Datasheet LT7101 (Analog Devices) - 8
| 制造商 | Analog Devices |
| 描述 | 105V, 1A Low EMI Synchronous Step-Down Regulator with Fast Current Programming |
| 页数 / 页 | 38 / 8 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| 文件格式/大小 | PDF / 3.2 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Load Step Forced Continuous
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LT7101
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Load Step Forced Continuous Load Step Burst Mode Operation Load Step Pulse-Skipping Mode Mode
VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV IL IL IL 500mA/DIV 500mA/DIV 500mA/DIV 40µs/DIV 7101 G25 40µs/DIV 7101 G26 40µs/DIV 7101 G27 LOAD STEP = 50mA TO 500mA LOAD STEP = 50mA TO 500mA LOAD STEP = 50mA TO 500mA VIN = 48V VIN = 48V VIN = 48V FIGURE 14 CIRCUIT FIGURE 14 CIRCUIT FIGURE 14 CIRCUIT
SW Node Waveform at Full Load Synchronization to External Clock Start-Up from Shutdown
V V SW OUT 20V/DIV 2V/DIV IL 500mA/DIV VSW EXTERNAL 10V/DIV CLOCK ON VRUN PLLIN/MODE 5V/DIV 1V/DIV 50ns/DIV 7101 G28 15µs/DIV 7101 G29 200µs/DIV 7101 G30 VIN = 48V V V IN = 48V IN = 48V ILOAD = 1A I Burst Mode OPERATION LOAD = 500mA FIGURE 14 CIRCUIT FIGURE 14 CIRCUIT FIGURE 14 CIRCUIT
Output Current Programming ICTRL Voltage to Inductor Current Short-Circuit and Recovery Current Loop Step Response Gain vs Frequency
1.4 V 1.2 ICTRL 500mV/DIV VOUT 1.0 2V/DIV BW = 93kHz 0.8 IL 0.6 IL 250mA/DIV VIN = 24V 500mA/DIV VOUT = 4V 0.4 RICTRL = 40.2k I 7101 G31 OUT(AVG) = 500mA 100µs/DIV 40µs/DIV 7101 G32 TAGE TO INDUCTOR CURRENT GAIN (A/V) 0.2 fSW = 300kHz VIN = 48V VICTRL = 0.76V TO 1.12V PULSE VOL FIGURE 14 CIRCUIT PULSE–SKIPPING MODE VIN = 48V, VOUT = 4V 0 FIGURE 14 CIRCUIT FIGURE 14 CIRCUIT I CTRL 0.1 1 10 100 300 FREQUENCY (kHz) 7101 G33 Rev. 0 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Load Step Forced Continuous Load Step Burst Mode Operation Load Step Pulse-Skipping Mode Mode
VOUT VOUT VOUT 100mV/DIV 100mV/DIV 100mV/DIV IL IL IL 500mA/DIV 500mA/DIV 500mA/DIV 40µs/DIV 7101 G25 40µs/DIV 7101 G26 40µs/DIV 7101 G27 LOAD STEP = 50mA TO 500mA LOAD STEP = 50mA TO 500mA LOAD STEP = 50mA TO 500mA VIN = 48V VIN = 48V VIN = 48V FIGURE 14 CIRCUIT FIGURE 14 CIRCUIT FIGURE 14 CIRCUIT
SW Node Waveform at Full Load Synchronization to External Clock Start-Up from Shutdown
V V SW OUT 20V/DIV 2V/DIV IL 500mA/DIV VSW EXTERNAL 10V/DIV CLOCK ON VRUN PLLIN/MODE 5V/DIV 1V/DIV 50ns/DIV 7101 G28 15µs/DIV 7101 G29 200µs/DIV 7101 G30 VIN = 48V V V IN = 48V IN = 48V ILOAD = 1A I Burst Mode OPERATION LOAD = 500mA FIGURE 14 CIRCUIT FIGURE 14 CIRCUIT FIGURE 14 CIRCUIT
Output Current Programming ICTRL Voltage to Inductor Current Short-Circuit and Recovery Current Loop Step Response Gain vs Frequency
1.4 V 1.2 ICTRL 500mV/DIV VOUT 1.0 2V/DIV BW = 93kHz 0.8 IL 0.6 IL 250mA/DIV VIN = 24V 500mA/DIV VOUT = 4V 0.4 RICTRL = 40.2k I 7101 G31 OUT(AVG) = 500mA 100µs/DIV 40µs/DIV 7101 G32 TAGE TO INDUCTOR CURRENT GAIN (A/V) 0.2 fSW = 300kHz VIN = 48V VICTRL = 0.76V TO 1.12V PULSE VOL FIGURE 14 CIRCUIT PULSE–SKIPPING MODE VIN = 48V, VOUT = 4V 0 FIGURE 14 CIRCUIT FIGURE 14 CIRCUIT I CTRL 0.1 1 10 100 300 FREQUENCY (kHz) 7101 G33 Rev. 0 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts