Datasheet LTC3828 (Analog Devices) - 7
| 制造商 | Analog Devices |
| 描述 | Dual, 2-Phase Step-Down Controller with Tracking |
| 页数 / 页 | 32 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. … |
| 文件格式/大小 | PDF / 388 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Input Source/Capacitor
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LTC3828
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Input Source/Capacitor Load Step: Burst Mode Operation Load Step: Continuous Mode Instantaneous Current (Figure 14) (Figure 14) (Figure 14)
SW1 VOUT1 VOUT1 20V/DIV 100mV/DIV 100mV/DIV SW2 20V/DIV VOUT2 VOUT2 100mV/DIV 100mV/DIV IIN 25A/DIV IL1 IL1 2A/DIV 2A/DIV VIN RIPPLE 50mV/DIV V 50μs/DIV IN = 12V V 50μs/DIV IN = 12V V 500ns/DIV IN = 12V VOUT1 = 5V VOUT1 = 5V VOUT1 = 5V VOUT2 = 3.3V VOUT2 = 3.3V VOUT2 = 3.3V LOAD STEP = 0A TO 3A LOAD STEP = 0A TO 3A I 3828 G24 OUT5 = IOUT3.3 = 2A WITH RATIOMETRIC TRACKING 3828 G22 WITH RATIOMETRIC TRACKING 3828 G23
Burst Mode Operation Constant Frequency (Burst (Figure 14) Inhibit) Operation (Figure 14)
VOUT VOUT 20mV/DIV 20mV/DIV IL IL 1A/DIV 0.5A/DIV V 100μs/DIV IN = 12V V 2μs/DIV IN = 12V VOUT = 5V VOUT = 5V VFCB = OPEN VFCB = 5V I 3828 G25 OUT = 20mA I 3828 G26 OUT = 20mA
PIN FUNCTIONS (SSOP/QFN) ITH1, ITH2 (Pins 2, 13/Pins 30, 12):
Error Amplifi er Output
PLLFLTR (Pin 6/Pin 2):
Filter Connection for Phase-Locked and Switching Regulator Compensation Point. Each as- Loop. Alternatively, this pin can be driven with an AC or sociated channels’ current comparator trip point increases DC voltage source to vary the frequency of the internal with this control voltage. oscillator.
PHSMD (Pin 4, QFN Only):
Control input to phase selector
FCB/PLLIN (Pin 8/Pin 5):
Forced Continuous Control Input which determines the phase relationship between control- and External Synchronization Input to Phase Detector. Pull- ler 1, controller 2 and the clockout signal. ing this pin below 0.8V will force continuous synchronous
V
operation. Feeding an external clock signal will synchronize
OSENSE1, VOSENSE2 (Pins 5, 14/Pins 1, 13):
Error Amplifi er Feedback Input. Receives the remotely-sensed feedback the LTC3828 to the external clock. voltage for each controller from an external resistive divider across the output. 3828fc 7
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Input Source/Capacitor Load Step: Burst Mode Operation Load Step: Continuous Mode Instantaneous Current (Figure 14) (Figure 14) (Figure 14)
SW1 VOUT1 VOUT1 20V/DIV 100mV/DIV 100mV/DIV SW2 20V/DIV VOUT2 VOUT2 100mV/DIV 100mV/DIV IIN 25A/DIV IL1 IL1 2A/DIV 2A/DIV VIN RIPPLE 50mV/DIV V 50μs/DIV IN = 12V V 50μs/DIV IN = 12V V 500ns/DIV IN = 12V VOUT1 = 5V VOUT1 = 5V VOUT1 = 5V VOUT2 = 3.3V VOUT2 = 3.3V VOUT2 = 3.3V LOAD STEP = 0A TO 3A LOAD STEP = 0A TO 3A I 3828 G24 OUT5 = IOUT3.3 = 2A WITH RATIOMETRIC TRACKING 3828 G22 WITH RATIOMETRIC TRACKING 3828 G23
Burst Mode Operation Constant Frequency (Burst (Figure 14) Inhibit) Operation (Figure 14)
VOUT VOUT 20mV/DIV 20mV/DIV IL IL 1A/DIV 0.5A/DIV V 100μs/DIV IN = 12V V 2μs/DIV IN = 12V VOUT = 5V VOUT = 5V VFCB = OPEN VFCB = 5V I 3828 G25 OUT = 20mA I 3828 G26 OUT = 20mA
PIN FUNCTIONS (SSOP/QFN) ITH1, ITH2 (Pins 2, 13/Pins 30, 12):
Error Amplifi er Output
PLLFLTR (Pin 6/Pin 2):
Filter Connection for Phase-Locked and Switching Regulator Compensation Point. Each as- Loop. Alternatively, this pin can be driven with an AC or sociated channels’ current comparator trip point increases DC voltage source to vary the frequency of the internal with this control voltage. oscillator.
PHSMD (Pin 4, QFN Only):
Control input to phase selector
FCB/PLLIN (Pin 8/Pin 5):
Forced Continuous Control Input which determines the phase relationship between control- and External Synchronization Input to Phase Detector. Pull- ler 1, controller 2 and the clockout signal. ing this pin below 0.8V will force continuous synchronous
V
operation. Feeding an external clock signal will synchronize
OSENSE1, VOSENSE2 (Pins 5, 14/Pins 1, 13):
Error Amplifi er Feedback Input. Receives the remotely-sensed feedback the LTC3828 to the external clock. voltage for each controller from an external resistive divider across the output. 3828fc 7