Datasheet ADP1851 (Analog Devices) - 9
| Fabricante | Analog Devices |
| Descripción | Wide Range Input, Synchronous, Step-Down DC-to-DC Controller |
| Páginas / Página | 24 / 9 — Data Sheet. ADP1851. TYPICAL PERFORMANCE CHARACTERISTICS. 100. PULSE … |
| Revisión | B |
| Formato / tamaño de archivo | PDF / 1.1 Mb |
| Idioma del documento | Inglés |
Data Sheet. ADP1851. TYPICAL PERFORMANCE CHARACTERISTICS. 100. PULSE SKIP. FORCED PWM. ) %. IE C. FFIC. FFI. 0.1. LOAD (A). LOAD. LOAD CURRENT
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Data Sheet ADP1851 TYPICAL PERFORMANCE CHARACTERISTICS 100 100 PULSE SKIP PULSE SKIP 90 FORCED PWM 90 FORCED PWM 80 80 70 70 ) ) % (% 60 ( 60 Y Y C C N 50 N 50 IE IE C 40 FFIC 40 FFI E E 30 30 20 20 10 10 0 0
7
0.1 1 10 100
004
0.1 1 10 100
00
LOAD (A)
595- 10595-
LOAD (A)
10 Figure 4. Efficiency Plot Figure 7. Efficiency Plot 12 VIN to 1.8 VOUT, 600 kHz (see Figure 34 for Circuit) 12 VIN to 3.3 VOUT, 300 kHz (see Figure 35 for Circuit)
LOAD LOAD CURRENT CURRENT 4 4 VOUT_AC VOUT_AC 2 2
5
CH2 100mV
008
B M 100µs 50MS/s A CH4 13.4A
00
CH2 200mV BW M 100µs 5.0MS/s A CH4 14.2A W CH4 10A
595-
B 20ns/pt Ω
595-
CH4 10A Ω BW 200ns/pt W
10 10 Figure 5. 10 A to 20 A Load Step, Figure 8. 10 A to 20 A Load Step, 12 VIN to 1.8 VOUT, 600 kHz, Current Mode 12 VIN to 3.3 VOUT, 300 kHz, Voltage Mode
VIN VIN 1 1 VOUT_AC VOUT_AC 2 2 DL
9 006 00
CH1 5V B B CH1 5V B CH2 200mV B M 100µs 250MS/s A CH1 11.3V W CH2 100mV W M 100µs 125MS/s A CH1 11.3V
95-
W W
595-
8.0ns/pt 4ns/pt
105 10 Figure 6. 9 V to 15 V Line Step, Figure 9. 9 V to 15 V Line Step, 1.8 VOUT, 20 A Load, Current Mode 3.3 VOUT, 15 A Load, Voltage Mode Rev. B | Page 9 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
Data Sheet ADP1851 TYPICAL PERFORMANCE CHARACTERISTICS 100 100 PULSE SKIP PULSE SKIP 90 FORCED PWM 90 FORCED PWM 80 80 70 70 ) ) % (% 60 ( 60 Y Y C C N 50 N 50 IE IE C 40 FFIC 40 FFI E E 30 30 20 20 10 10 0 0
7
0.1 1 10 100
004
0.1 1 10 100
00
LOAD (A)
595- 10595-
LOAD (A)
10 Figure 4. Efficiency Plot Figure 7. Efficiency Plot 12 VIN to 1.8 VOUT, 600 kHz (see Figure 34 for Circuit) 12 VIN to 3.3 VOUT, 300 kHz (see Figure 35 for Circuit)
LOAD LOAD CURRENT CURRENT 4 4 VOUT_AC VOUT_AC 2 2
5
CH2 100mV
008
B M 100µs 50MS/s A CH4 13.4A
00
CH2 200mV BW M 100µs 5.0MS/s A CH4 14.2A W CH4 10A
595-
B 20ns/pt Ω
595-
CH4 10A Ω BW 200ns/pt W
10 10 Figure 5. 10 A to 20 A Load Step, Figure 8. 10 A to 20 A Load Step, 12 VIN to 1.8 VOUT, 600 kHz, Current Mode 12 VIN to 3.3 VOUT, 300 kHz, Voltage Mode
VIN VIN 1 1 VOUT_AC VOUT_AC 2 2 DL
9 006 00
CH1 5V B B CH1 5V B CH2 200mV B M 100µs 250MS/s A CH1 11.3V W CH2 100mV W M 100µs 125MS/s A CH1 11.3V
95-
W W
595-
8.0ns/pt 4ns/pt
105 10 Figure 6. 9 V to 15 V Line Step, Figure 9. 9 V to 15 V Line Step, 1.8 VOUT, 20 A Load, Current Mode 3.3 VOUT, 15 A Load, Voltage Mode Rev. B | Page 9 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