Datasheet LTC3894 (Analog Devices) - 5
| 制造商 | Analog Devices |
| 描述 | 150V Low IQ Step-Down DC/DC Controller with 100% Duty Cycle Capability |
| 页数 / 页 | 36 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| 修订版 | A |
| 文件格式/大小 | PDF / 2.9 Mb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Pulse-Skipping Mode Operation. Burst Mode Operation
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LTC3894
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Pulse-Skipping Mode Operation Burst Mode Operation Transient Response: Waveforms Waveforms Pulse-Skipping Mode Operation
VOUT VOUT 50mV/DIV 50mV/DIV IL 2A/DIV VSW 10V/DIV ILOAD VSW 2A/DIV 10V/DIV I V L OUT IL 500mA/DIV 100mV/DIV 500mA/DIV 2µs/DIV 3894 G01 20µs/DIV 3894 G02 100µs/DIV 3894 G03 VIN = 12V VIN = 12V VIN = 12V VOUT = 5V VOUT = 5V VOUT = 5V ILOAD = 100mA ILOAD = 100mA LOAD STEP = 100mA TO 2A FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT
Transient Response: Dropout Behavior Burst Mode Operation (100% Duty Cycle) Low VIN Operation
VIN IL 2V/DIV 2A/DIV VIN ILOAD VOUT = VIN 2V/DIV 2A/DIV VOUT 2V/DIV V VOUT DROPOUT OUT GATE 2V/DIV 100mV/DIV 10V/DIV SW 10V/DIV 100µs/DIV 3894 G04 100ms/DIV 3894 G05 20ms/DIV 3894 G06 VIN = 12V VIN TRANSIENT 12V TO 4V VIN = 0V TO 7.8V VOUT = 5V AND BACK TO 12V AND BACK TO 0V LOAD STEP = 100mA TO 2A VOUT = 12V, ILOAD = 100mA VOUT = 5V, ILOAD = 100mA FIGURE 11 CIRCUIT FIGURE 14 CIRCUIT FIGURE 11 CIRCUIT
Soft Start-Up into a Prebiased Normal Soft Start-Up Output Output Tracking
RUN VIN 5V/DIV 5V/DIV VOUT PREBIASED TO 2.6V VOUT TRACKSS 1V/DIV 200mV/DIV TRACK/SS 200mV/DIV V TRACK/SS OUT 1V/DIV 500mV/DIV VOUT 2V/DIV 1ms/DIV 3894 G07 2ms/DIV 3894 G08 20ms/DIV 3894 G09 VIN = 12V VIN = 12V VIN = 12V VOUT = 5V VOUT = 5V VOUT = 5V ILOAD = 100mA ILOAD = 500mA ILOAD = 500mA FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT Rev. A For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Pulse-Skipping Mode Operation Burst Mode Operation Transient Response: Waveforms Waveforms Pulse-Skipping Mode Operation
VOUT VOUT 50mV/DIV 50mV/DIV IL 2A/DIV VSW 10V/DIV ILOAD VSW 2A/DIV 10V/DIV I V L OUT IL 500mA/DIV 100mV/DIV 500mA/DIV 2µs/DIV 3894 G01 20µs/DIV 3894 G02 100µs/DIV 3894 G03 VIN = 12V VIN = 12V VIN = 12V VOUT = 5V VOUT = 5V VOUT = 5V ILOAD = 100mA ILOAD = 100mA LOAD STEP = 100mA TO 2A FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT
Transient Response: Dropout Behavior Burst Mode Operation (100% Duty Cycle) Low VIN Operation
VIN IL 2V/DIV 2A/DIV VIN ILOAD VOUT = VIN 2V/DIV 2A/DIV VOUT 2V/DIV V VOUT DROPOUT OUT GATE 2V/DIV 100mV/DIV 10V/DIV SW 10V/DIV 100µs/DIV 3894 G04 100ms/DIV 3894 G05 20ms/DIV 3894 G06 VIN = 12V VIN TRANSIENT 12V TO 4V VIN = 0V TO 7.8V VOUT = 5V AND BACK TO 12V AND BACK TO 0V LOAD STEP = 100mA TO 2A VOUT = 12V, ILOAD = 100mA VOUT = 5V, ILOAD = 100mA FIGURE 11 CIRCUIT FIGURE 14 CIRCUIT FIGURE 11 CIRCUIT
Soft Start-Up into a Prebiased Normal Soft Start-Up Output Output Tracking
RUN VIN 5V/DIV 5V/DIV VOUT PREBIASED TO 2.6V VOUT TRACKSS 1V/DIV 200mV/DIV TRACK/SS 200mV/DIV V TRACK/SS OUT 1V/DIV 500mV/DIV VOUT 2V/DIV 1ms/DIV 3894 G07 2ms/DIV 3894 G08 20ms/DIV 3894 G09 VIN = 12V VIN = 12V VIN = 12V VOUT = 5V VOUT = 5V VOUT = 5V ILOAD = 100mA ILOAD = 500mA ILOAD = 500mA FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT Rev. A For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts