Datasheet LT1946A (Linear Technology) - 3
| 制造商 | Linear Technology |
| 描述 | 2.7MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start |
| 页数 / 页 | 12 / 3 — TYPICAL PERFOR A CE CHARACTERISTICS. Feedback Pin Voltage. Oscillator … |
| 修订版 | S |
| 文件格式/大小 | PDF / 326 Kb |
| 文件语言 | 英语 |
TYPICAL PERFOR A CE CHARACTERISTICS. Feedback Pin Voltage. Oscillator Frequency. Current Limit. Switching Waveforms for
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文件文字版本
LT1946A
W U TYPICAL PERFOR A CE CHARACTERISTICS Feedback Pin Voltage Oscillator Frequency Current Limit
1.28 3000 2.6 2.4 1.27 2700 2.2 2400 1.26 T 2.0 A = –30°C TA = 100°C 2100 1.8 1.25 1800 1.6 1.4 1.24 1500 TA = 25°C 1.2 1.23 1200 1.0 900 CURRENT LIMIT (A) 0.8 FEEDBACK VOLTAGE (V) 1.22 0.6 OSCILLATOR FREQUENCY (kHz) 600 1.21 0.4 300 0.2 1.20 0 0 –50 –25 0 25 50 75 100 125 0 0.2 0.4 0.6 0.8 1 1.2 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) FEEDBACK VOLTAGE (V) TEMPERATURE (°C) 1946A G01 1946A G02 1946A G03
Switching Waveforms for Switch Saturation Voltage Quiescent Current Figure 1 Circuit
0.35 4.0 VOUT 3.8 0.30 100mV/DIV AC COUPLED 3.6 0.25 3.4 VSW 10V/DIV (V) 0.20 3.2 0V CESAT 3.0 V 0.15 2.8 ILI 0.10 0.5A/DIV QUIESCENT CURRENT (mA) 2.6 0.05 100ns/DIV 1946A G06 2.4 0 2.2 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 –50 –25 0 25 50 75 100 125 SWITCH CURRENT (A) TEMPERATURE (°C) 1946A G04 1946A G05
Transient Response for Start-Up Waveforms for Figure 1 Circuit Figure 1 Circuit
VOUT V 100mV/DIV OUT 2V/DIV AC COUPLED IIN ILI 200mA/DIV 0.5A/DIV 0A 250mA 5V I V LOAD SHDN 150mA 0V 50µs/DIV 1946A G07 RLOAD = 250Ω 1ms/DIV 1946A G08 sn1946a 1946afs 3
W U TYPICAL PERFOR A CE CHARACTERISTICS Feedback Pin Voltage Oscillator Frequency Current Limit
1.28 3000 2.6 2.4 1.27 2700 2.2 2400 1.26 T 2.0 A = –30°C TA = 100°C 2100 1.8 1.25 1800 1.6 1.4 1.24 1500 TA = 25°C 1.2 1.23 1200 1.0 900 CURRENT LIMIT (A) 0.8 FEEDBACK VOLTAGE (V) 1.22 0.6 OSCILLATOR FREQUENCY (kHz) 600 1.21 0.4 300 0.2 1.20 0 0 –50 –25 0 25 50 75 100 125 0 0.2 0.4 0.6 0.8 1 1.2 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) FEEDBACK VOLTAGE (V) TEMPERATURE (°C) 1946A G01 1946A G02 1946A G03
Switching Waveforms for Switch Saturation Voltage Quiescent Current Figure 1 Circuit
0.35 4.0 VOUT 3.8 0.30 100mV/DIV AC COUPLED 3.6 0.25 3.4 VSW 10V/DIV (V) 0.20 3.2 0V CESAT 3.0 V 0.15 2.8 ILI 0.10 0.5A/DIV QUIESCENT CURRENT (mA) 2.6 0.05 100ns/DIV 1946A G06 2.4 0 2.2 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 –50 –25 0 25 50 75 100 125 SWITCH CURRENT (A) TEMPERATURE (°C) 1946A G04 1946A G05
Transient Response for Start-Up Waveforms for Figure 1 Circuit Figure 1 Circuit
VOUT V 100mV/DIV OUT 2V/DIV AC COUPLED IIN ILI 200mA/DIV 0.5A/DIV 0A 250mA 5V I V LOAD SHDN 150mA 0V 50µs/DIV 1946A G07 RLOAD = 250Ω 1ms/DIV 1946A G08 sn1946a 1946afs 3