L7985 datasheet(2/42 Pages) STMICROELECTRONICS

Nome de Peças	L7985

Descrição Electrónicos	Voltage feed-forward

Download	42 Pages

Scroll/Zoom	100%

Fabricante Electrônico	STMICROELECTRONICS [STMicroelectronics]

Página de início	http://www.st.com

Logo

2 / 42 page

Contents

L7985

2/42

DocID022446 Rev 7

Contents

1

Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1

Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.2

Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2

Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3

Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4

Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

5

Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5.1

Oscillator and synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.2

Soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

5.3

Error amplifier and compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

5.4

Overcurrent protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.5

Enable function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.6

Hysteretic thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6

Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6.1

Input capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

6.2

Inductor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

6.3

Output capacitor selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

6.4

Compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

6.4.1

Type III compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

6.4.2

Type II compensation network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

6.5

Thermal considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

6.6

Layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

6.7

Application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

7

Application ideas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

7.1

Positive buck-boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

7.2

Inverting buck-boost . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Nº de peça semelhante - L7985

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
STMicroelectronics	L7980	1Mb / 44P	2 A step-down switching regulator
	L7980A	1Mb / 44P	2 A step-down switching regulator
	L7980ATR	1Mb / 44P	2 A step-down switching regulator
	L7980TR	1Mb / 44P	2 A step-down switching regulator
	L7981	1Mb / 44P	3 A step-down switching regulator

More results

Descrição semelhante - L7985

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
STMicroelectronics	A5975AD	2Mb / 50P	Voltage feed-forward April 2011 Rev 1
STMicroelectronics	A5975D	1Mb / 50P	Voltage feed-forward April 2011Rev 1
Texas Instruments	TPS40074	529Kb / 38P	[Old version datasheet] MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER WITH VOLTAGE FEED-FORWARD
	TPS40074	454Kb / 38P	[Old version datasheet] MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER WITH VOLTAGE FEED-FORWARD
	TPS40075	809Kb / 44P	[Old version datasheet] MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER WITH VOLTAGE FEED-FORWARD
	TPS40075	1Mb / 44P	[Old version datasheet] MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER WITH VOLTAGE FEED-FORWARD
ON Semiconductor	CS51220	470Kb / 16P	Feed Forward Voltage Mode PWM Controller with Programmable Synchronization July, 2006??Rev. 7
Texas Instruments	TPS40074	999Kb / 42P	[Old version datasheet] MIDRANGE INPUT SYNCHRONOUS BUCK CONTROLLER WITH VOLTAGE FEED-FORWARD
Intersil Corporation	ISL6740A	320Kb / 15P	Flexible Double-Ended Voltage-Mode PWM Controller with Voltage Feed Forward
Renesas Technology Corp	ISL6740A	660Kb / 14P	Flexible Double-Ended Voltage-Mode PWM Controller with Voltage Feed Forward

More results

L7985 Folha de dados(PDF) 2 Page - STMicroelectronics

L7985 Folha de dados(HTML) 2 Page - STMicroelectronics

Nº de peça semelhante - L7985

Descrição semelhante - L7985

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

Folha de dados Download

Ligação URL