Datasheet ADP1851 (Analog Devices) - 10
| Fabricante | Analog Devices |
| Descripción | Wide Range Input, Synchronous, Step-Down DC-to-DC Controller |
| Páginas / Página | 24 / 10 — ADP1851. Data Sheet. SYNC. VOUT. CH1 5V. M 1.0µs 250MS/s A CH1 3.1V. CH1 … |
| Revisión | B |
| Formato / tamaño de archivo | PDF / 1.1 Mb |
| Idioma del documento | Inglés |
ADP1851. Data Sheet. SYNC. VOUT. CH1 5V. M 1.0µs 250MS/s A CH1 3.1V. CH1 1V. CH2 500mV B. M 2ms 250kS/s. A CH1 580mV. CH3 10V B. CH4 5V. 4ns/pt
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ADP1851 Data Sheet EN SYNC 1 1 SW 3 DH 3 VOUT DL 4 2
0 3
CH1 5V B M 1.0µs 250MS/s A CH1 3.1V
01
CH1 1V B CH2 500mV B M 2ms 250kS/s A CH1 580mV
01
W W W CH3 10V B CH4 5V B 4ns/pt CH3 10V B 4µs/pt
595-
W W
10595-
W
10 Figure 10. Synchronization, fSYNC = 600 kHz Figure 13. Soft Start with Precharged Output, 1.8 VOUT Forced PWM Mode
35 45 VIN = 12V TA = 25°C 34 OUTPUT IS LOADED 43 OUTPUT IS LOADED HS FET = BSC080N03LS HS FET = BSC080N03LS 33 LS FET = BSC030N03LS 41 LS FET = BSC030N03LS 32 39 s) s) 31 (n 37 (n E E IM 30 IM T 35 T D A 29 AD 33 DE DE 28 31 27 29 26 27 DEAD TIME BETWEEN SW FALLING EDGE DEAD TIME BETWEEN SW FALLING EDGE AND DL RISING EDGE, INCLUDING DIODE RECOVERY TIME AND DL RISING EDGE, INCLUDING DIODE RECOVERY TIME 25 25 –40 –20 0 20 40 60 80 100 120 140
011
0 5 10 15 20
014
TEMPERATURE (°C)
595- 95- 10
VIN (V)
105 Figure 11. Dead Time vs. Temperature Figure 14. Dead Time vs. VIN
350 4.5 4.0 300 VIN = 2.75V, SOURCING DH MINIMUM OFF TIME 3.5 ) (Ω 250 E 3.0 C N VIN = 12V, SOURCING s) A 2.5 (n E 200 SIST E 2.0 V TIM R IN = 2.75V, SINKING ER 150 1.5 IV R V D IN = 12V, SINKING 1.0 100 DH MINIMUM ON TIME 0.5 50 0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0
012
–40 –15 10 35 60 85 110 135
036 5-
VIN (V) TEMPERATURE (°C)
10595- 1059 Figure 12. Typical DH Minimum On Time and Off Time Figure 15. Driver Resistance vs. Temperature Rev. B | Page 10 of 24 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL OPERATION CIRCUIT REVISION HISTORY SIMPLIFIED BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL ARCHITECTURE OSCILLATOR FREQUENCY SYNCHRONIZATION PWM AND PULSE SKIP MODES OF OPERATION SYNCHRONOUS RECTIFIER AND DEAD TIME INPUT UNDERVOLTAGE LOCKOUT INTERNAL LINEAR REGULATOR OVERVOLTAGE PROTECTION POWER GOOD SHORT-CIRCUIT AND CURRENT-LIMIT PROTECTION ENABLE/DISABLE CONTROL THERMAL OVERLOAD PROTECTION APPLICATIONS INFORMATION ADIsimPower DESIGN TOOL SETTING THE OUTPUT VOLTAGE SOFT START SETTING THE CURRENT LIMIT ACCURATE CURRENT-LIMIT SENSING INPUT CAPACITOR SELECTION VIN PIN FILTER BOOST CAPACITOR SELECTION INDUCTOR SELECTION OUTPUT CAPACITOR SELECTION MOSFET SELECTION LOOP COMPENSATION—VOLTAGE MODE Type III Compensation LOOP COMPENSATION—CURRENT MODE Setting the Slope Compensation Setting the Current Sense Gain Type II Compensation SWITCHING NOISE AND OVERSHOOT REDUCTION VOLTAGE TRACKING Coincident Tracking Ratiometric Tracking PCB LAYOUT GUIDELINES TYPICAL OPERATING CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE
0 3
CH1 5V B M 1.0µs 250MS/s A CH1 3.1V
01
CH1 1V B CH2 500mV B M 2ms 250kS/s A CH1 580mV
01
W W W CH3 10V B CH4 5V B 4ns/pt CH3 10V B 4µs/pt
595-
W W
10595-
W
10 Figure 10. Synchronization, fSYNC = 600 kHz Figure 13. Soft Start with Precharged Output, 1.8 VOUT Forced PWM Mode
35 45 VIN = 12V TA = 25°C 34 OUTPUT IS LOADED 43 OUTPUT IS LOADED HS FET = BSC080N03LS HS FET = BSC080N03LS 33 LS FET = BSC030N03LS 41 LS FET = BSC030N03LS 32 39 s) s) 31 (n 37 (n E E IM 30 IM T 35 T D A 29 AD 33 DE DE 28 31 27 29 26 27 DEAD TIME BETWEEN SW FALLING EDGE DEAD TIME BETWEEN SW FALLING EDGE AND DL RISING EDGE, INCLUDING DIODE RECOVERY TIME AND DL RISING EDGE, INCLUDING DIODE RECOVERY TIME 25 25 –40 –20 0 20 40 60 80 100 120 140
011
0 5 10 15 20
014
TEMPERATURE (°C)
595- 95- 10
VIN (V)
105 Figure 11. Dead Time vs. Temperature Figure 14. Dead Time vs. VIN
350 4.5 4.0 300 VIN = 2.75V, SOURCING DH MINIMUM OFF TIME 3.5 ) (Ω 250 E 3.0 C N VIN = 12V, SOURCING s) A 2.5 (n E 200 SIST E 2.0 V TIM R IN = 2.75V, SINKING ER 150 1.5 IV R V D IN = 12V, SINKING 1.0 100 DH MINIMUM ON TIME 0.5 50 0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0
012
–40 –15 10 35 60 85 110 135
036 5-
VIN (V) TEMPERATURE (°C)
10595- 1059 Figure 12. Typical DH Minimum On Time and Off Time Figure 15. Driver Resistance vs. Temperature Rev. B | Page 10 of 24 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL OPERATION CIRCUIT REVISION HISTORY SIMPLIFIED BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL ARCHITECTURE OSCILLATOR FREQUENCY SYNCHRONIZATION PWM AND PULSE SKIP MODES OF OPERATION SYNCHRONOUS RECTIFIER AND DEAD TIME INPUT UNDERVOLTAGE LOCKOUT INTERNAL LINEAR REGULATOR OVERVOLTAGE PROTECTION POWER GOOD SHORT-CIRCUIT AND CURRENT-LIMIT PROTECTION ENABLE/DISABLE CONTROL THERMAL OVERLOAD PROTECTION APPLICATIONS INFORMATION ADIsimPower DESIGN TOOL SETTING THE OUTPUT VOLTAGE SOFT START SETTING THE CURRENT LIMIT ACCURATE CURRENT-LIMIT SENSING INPUT CAPACITOR SELECTION VIN PIN FILTER BOOST CAPACITOR SELECTION INDUCTOR SELECTION OUTPUT CAPACITOR SELECTION MOSFET SELECTION LOOP COMPENSATION—VOLTAGE MODE Type III Compensation LOOP COMPENSATION—CURRENT MODE Setting the Slope Compensation Setting the Current Sense Gain Type II Compensation SWITCHING NOISE AND OVERSHOOT REDUCTION VOLTAGE TRACKING Coincident Tracking Ratiometric Tracking PCB LAYOUT GUIDELINES TYPICAL OPERATING CIRCUITS OUTLINE DIMENSIONS ORDERING GUIDE