Datasheet LTC3736-1 (Analog Devices) - 4
| Fabricante | Analog Devices |
| Descripción | Dual 2-Phase, No RSENSE , Synchronous Controller with Spread Spectrum |
| Páginas / Página | 28 / 4 — TYPICAL PERFOR A CE CHARACTERISTICS TA = 25. C unless otherwise noted. … |
| Formato / tamaño de archivo | PDF / 541 Kb |
| Idioma del documento | Inglés |
TYPICAL PERFOR A CE CHARACTERISTICS TA = 25. C unless otherwise noted. Efficiency and Power Lost vs. Load Step. Load Current
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LTC3736-1
W U TYPICAL PERFOR A CE CHARACTERISTICS TA = 25
°
C unless otherwise noted. Efficiency and Power Lost vs Load Step Load Step Load Current (Spread Spectrum Enabled) (Spread Spectrum Disabled)
10 100 FIGURE 13 CIRCUIT VIN = 5V 95 VOUT VOUT 90 AC-COUPLED AC-COUPLED 1 100mV/DIV 100mV/DIV 85 EFFICIENCY (%) 80 0.1 75 IL IL 70 2A/DIV 2A/DIV POWER LOST (W) 65 0.01 60 VIN = 3.3V 100µs/DIV 37361 G02 VIN = 3.3V 100µs/DIV 37361 G03 VOUT = 2.5V 55 VOUT = 1.8V VOUT = 1.8V VOUT = 1.8V ILOAD = 300mA TO 3A ILOAD = 300mA TO 3A 0.001 50 SSDIS = GND SSDIS = VIN 1 10 100 1000 10000 FIGURE 15 CIRCUIT FIGURE 15 CIRCUIT LOAD CURRENT (mA) 37361 G01
Input Voltage Noise Input Voltage Noise Tracking Start-Up with Internal (Spread Spectrum Disabled) (Spread Spectrum Enabled) Soft-Start (CSS = 0
µ
F)
–10 –10 FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT VOUT1 –20 VIN = 5V –20 VIN = 5V 2.5V V VOUT = 2.5V –30 OUT = 2.5V –30 R R V BW = 30Hz OUT2 BW = 30Hz SSDIS = V SSDIS = GND 1.8V –40 IN –40 500mV/ –50 –50 DIV –60 –60 –70 –70 AMPLITUDE (dBm) –80 AMPLITUDE (dBm) –80 –90 –90 VIN = 5V 200µs/DIV 37361 G06 –100 –100 RLOAD1 = RLOAD2 = 1Ω SSDIS = GND –110 –110 FIGURE 15 CIRCUIT 410k 450k 490k 530k 570k 610k 410k 450k 490k 530k 570k 610k FREQUENCY (Hz) FREQUENCY (Hz) 37361 G04 37361 G05
Tracking Start-Up with External Oscillator Frequency Soft-Start (C Output Voltage Ripple vs Input Voltage SS = 0.15
µ
F)
5 SSDIS = V V IN OUT1 SSDIS = VIN 4 2.5V CONSTANT VOUT2 550kHz 3 1.8V OPERATION 2 500mV/ 50mV/DIV 1 DIV AC-COUPLED 0 SSDIS = GND SPREAD –1 SPECTRUM –2 –3 VIN = 5V 40ms/DIV 37361 G07 1µs/DIV 37361 G20 R NORMALIZED FREQUENCY SHIFT (%) –4 LOAD1 = RLOAD2 = 1Ω FIGURE 15 CIRCUIT SSDIS = VIN ENVELOPE OF 100 SAMPLES –5 FIGURE 15 CIRCUIT 2 3 4 5 6 7 8 9 10 INPUT VOLTAGE (V) 37361 G08 37361f 4
W U TYPICAL PERFOR A CE CHARACTERISTICS TA = 25
°
C unless otherwise noted. Efficiency and Power Lost vs Load Step Load Step Load Current (Spread Spectrum Enabled) (Spread Spectrum Disabled)
10 100 FIGURE 13 CIRCUIT VIN = 5V 95 VOUT VOUT 90 AC-COUPLED AC-COUPLED 1 100mV/DIV 100mV/DIV 85 EFFICIENCY (%) 80 0.1 75 IL IL 70 2A/DIV 2A/DIV POWER LOST (W) 65 0.01 60 VIN = 3.3V 100µs/DIV 37361 G02 VIN = 3.3V 100µs/DIV 37361 G03 VOUT = 2.5V 55 VOUT = 1.8V VOUT = 1.8V VOUT = 1.8V ILOAD = 300mA TO 3A ILOAD = 300mA TO 3A 0.001 50 SSDIS = GND SSDIS = VIN 1 10 100 1000 10000 FIGURE 15 CIRCUIT FIGURE 15 CIRCUIT LOAD CURRENT (mA) 37361 G01
Input Voltage Noise Input Voltage Noise Tracking Start-Up with Internal (Spread Spectrum Disabled) (Spread Spectrum Enabled) Soft-Start (CSS = 0
µ
F)
–10 –10 FIGURE 13 CIRCUIT FIGURE 13 CIRCUIT VOUT1 –20 VIN = 5V –20 VIN = 5V 2.5V V VOUT = 2.5V –30 OUT = 2.5V –30 R R V BW = 30Hz OUT2 BW = 30Hz SSDIS = V SSDIS = GND 1.8V –40 IN –40 500mV/ –50 –50 DIV –60 –60 –70 –70 AMPLITUDE (dBm) –80 AMPLITUDE (dBm) –80 –90 –90 VIN = 5V 200µs/DIV 37361 G06 –100 –100 RLOAD1 = RLOAD2 = 1Ω SSDIS = GND –110 –110 FIGURE 15 CIRCUIT 410k 450k 490k 530k 570k 610k 410k 450k 490k 530k 570k 610k FREQUENCY (Hz) FREQUENCY (Hz) 37361 G04 37361 G05
Tracking Start-Up with External Oscillator Frequency Soft-Start (C Output Voltage Ripple vs Input Voltage SS = 0.15
µ
F)
5 SSDIS = V V IN OUT1 SSDIS = VIN 4 2.5V CONSTANT VOUT2 550kHz 3 1.8V OPERATION 2 500mV/ 50mV/DIV 1 DIV AC-COUPLED 0 SSDIS = GND SPREAD –1 SPECTRUM –2 –3 VIN = 5V 40ms/DIV 37361 G07 1µs/DIV 37361 G20 R NORMALIZED FREQUENCY SHIFT (%) –4 LOAD1 = RLOAD2 = 1Ω FIGURE 15 CIRCUIT SSDIS = VIN ENVELOPE OF 100 SAMPLES –5 FIGURE 15 CIRCUIT 2 3 4 5 6 7 8 9 10 INPUT VOLTAGE (V) 37361 G08 37361f 4