ADP1871 datasheet(38/44 Pages) AD

Part #	ADP1871

Description	Synchronous Buck Controller with Constant On-Time and Valley Current Mode

Download	44 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

Logo

38 / 44 page

ADP1870/ADP1871

Rev. 0 | Page 38 of 44

(component geometry permitting) that minimizes the area of

flux change as the event switches between D and 1 − D.

VOUT

SW

VIN

PGND

Figure 89. Primary Current Pathways During the On State of the Upper-Side

MOSFET (Left Arrow) and the On State of the Lower-Side MOSFET (Right Arrow)

DIFFERENTIAL SENSING

Because the ADP1870/ADP1871 operate in valley current-

mode control, a differential voltage reading is taken across the

drain and source of the lower-side MOSFET. The drain of the

lower-side MOSFET should be connected as close as possible to

the SW pin (Pin 9) of the IC. Likewise, the source should be

connected as close as possible to the PGND pin (Pin 7) of the

IC. When possible, both of these track lines should be narrow

and away from any other active device or voltage/current path.

LAYER 1: SENSE LINE FOR SW

(DRAIN OF LOWER MOSFET)

LAYER 1: SENSE LINE FOR PGND

(SOURCE OF LOWER MOSFET)

Figure 90. Drain/Source Tracking Tapping of the Lower-Side MOSFET for CS

Amp Differential Sensing (Yellow Sense Line on Layer 2)

Differential sensing should also be applied between the

outermost output capacitor to the feedback resistor divider (see

Figure 87 and Figure 88). Connect the positive terminal of the

output capacitor to the top resistor (RT). Connect the negative

terminal of the output capacitor to the negative terminal of the

bottom resistor, which connects to the analog ground plane as

well. Both of these track lines, as previously mentioned, should

be narrow and away from any other active device or voltage/

current path.

Similar Part No. - ADP1871

Manufacturer	Part #	Datasheet	Description
Cirrus Logic	ADP1870-0.3-EVALZ	1Mb / 10P	Evaluation Kit Rev A
Analog Devices	ADP1872	67Kb / 1P	Synchronous Current-Mode with Constant On-time, PWM Buck Rev. PrA
Cirrus Logic	ADP1873-0.3-EVALZ	1Mb / 10P	Evaluation Kit Rev A
Analog Devices	ADP1874	2Mb / 44P	Synchronous Buck Controller with Constant On-Time and Valley Current Mode REV. 0
Analog Devices	ADP1874-0.3-EVALZ	2Mb / 44P	Synchronous Buck Controller with Constant On-Time and Valley Current Mode REV. 0

More results

Similar Description - ADP1871

Manufacturer	Part #	Datasheet	Description
Analog Devices	ADP1874	2Mb / 44P	Synchronous Buck Controller with Constant On-Time and Valley Current Mode REV. 0
	ADP1882	1Mb / 40P	Synchronous Current-Mode with Constant On-Time,PWM Buck Controller REV. 0
	ADP1872	67Kb / 1P	Synchronous Current-Mode with Constant On-time, PWM Buck Rev. PrA
Vishay Siliconix	SIP12117	965Kb / 17P	3 A Current Mode Constant On-Time Synchronous Buck Regulator Rev. C, 29-Jun-2020
	SIP12116	978Kb / 17P	3 A Current Mode Constant On-Time Synchronous Buck Regulator Rev. D, 29-Jun-2020
	SIP12116	942Kb / 18P	3 A Current Mode Constant On-Time Synchronous Buck Regulator Rev. C, 06-Mar-17
	SIP12117	926Kb / 18P	3 A Current Mode Constant On-Time Synchronous Buck Regulator Rev. B, 06-Mar-17
Micrel Semiconductor	MIC2124	680Kb / 24P	Constant Frequency, Synchronous Current Mode Buck Controller
Vishay Siliconix	SIP12107	715Kb / 19P	5 V, 3 A Current-Mode Constant On-Time Synchronous Buck Regulator Rev. B, 20-Feb-12
Vishay Siliconix	SIP12107	911Kb / 20P	5 V, 3 A Current-Mode Constant On-Time Synchronous Buck Regulator Rev. C, 29-Jun-2020

More results

ADP1871 Datasheet(PDF) 38 Page - Analog Devices

ADP1871 Datasheet(HTML) 38 Page - Analog Devices

Similar Part No. - ADP1871

Similar Description - ADP1871

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44

Datasheet Download

Link URL