LM25010-Q1 datasheet(10/31 Pages) TI1

部件名	LM25010-Q1

功能描述	42-V, 1-A Step-Down Switching Regulator

Download	31 Pages

Scroll/Zoom	100%

制造商	TI1 [Texas Instruments]

网页	http://www.ti.com

标志

10 / 31 page

tON(min) =

VOUT x 300 ns

(VIN(min) ± VOUT)

RON =

VOUT x (VIN - 1.4V)

VIN x FS x 1.18 x 10

-10 - 1.4 k:

RON =

(tON - 67 ns) x (VIN - 1.4V)

1.18 x 10

-10

- 1.4 k:

tON =

1.18 x 10

-10

x (RON + 1.4k)

(VIN - 1.4V)

+ 67 ns

FB

SW

L1

C2

R1

R2

R3

BST

VCC

D2

C3

C4

D1

LM25010

VOUT

SGND

ISEN

10

LM25010, LM25010-Q1

SNVS419E – DECEMBER 2005 – REVISED MAY 2016

www.ti.com

Product Folder Links: LM25010 LM25010-Q1

Submit Documentation Feedback

Feature Description (continued)

Figure 8. Self-Biased Configuration

7.3.3 Regulation Comparator

The feedback voltage at the FB pin is compared to the voltage at the SS pin (2.5 V, ±2%). In normal operation an

ON-time period is initiated when the voltage at FB falls below 2.5 V. The buck switch conducts for the ON-time

programmed by RON, causing the FB voltage to rise above 2.5 V. After the ON-time period the buck switch

remains off until the FB voltage falls below 2.5 V. Input bias current at the FB pin is less than 5 nA over

temperature.

7.3.4 Overvoltage Comparator

The feedback voltage at FB is compared to an internal 2.9 V reference. If the voltage at FB rises above 2.9 V the

ON-time is immediately terminated. This condition can occur if the input voltage, or the output load, changes

suddenly. The buck switch remains off until the voltage at FB falls below 2.5 V.

7.3.5 ON-Time Control

The ON-time of the internal buck switch is determined by the RON resistor and the input voltage (VIN), and is

calculated with Equation 5.

(5)

The RON resistor can be determined from the desired ON-time by re-arranging Equation 5 to Equation 6.

(6)

To set a specific continuous conduction mode switching frequency (Fs), the RON resistor is determined from

Equation 7.

(7)

In high frequency applications the minimum value for tON is limited by the maximum duty cycle required for

regulation and the minimum OFF-time of the LM25010 (260 ns, ±15%). The fixed OFF-time limits the maximum

duty cycle achievable with a low voltage at VIN. The minimum allowed ON-time to regulate the desired VOUT at

the minimum VIN is determined from Equation 8.

(8)

类似零件编号 - LM25010-Q1

制造商	部件名	数据表	功能描述
National Semiconductor ...	LM25010	772Kb / 17P	42V, 1.0A Step-Down Switching Regulator
Texas Instruments	LM25010	1Mb / 27P	[Old version datasheet] 42V, 1.0A Step-Down Switching Regulator
National Semiconductor ...	LM25010	402Kb / 18P	42V, 1.0A Step-Down Switching Regulator
	LM25010MH	772Kb / 17P	42V, 1.0A Step-Down Switching Regulator
	LM25010MH	402Kb / 18P	42V, 1.0A Step-Down Switching Regulator

More results

类似说明 - LM25010-Q1

制造商	部件名	数据表	功能描述
STMicroelectronics	L5981	872Kb / 37P	1 A step-down switching regulator
Texas Instruments	LM5010A	1,017Kb / 25P	[Old version datasheet] High-Voltage 1-A Step-Down Switching Regulator
	LM2575	195Kb / 12P	[Old version datasheet] 1-A SIMPLE STEP DOWN SWITCHING VOLTAGE REGULATOR
	LM5010	1Mb / 26P	[Old version datasheet] High-Voltage 1-A Step-Down Switching Regulator
	LM5010A	1Mb / 28P	[Old version datasheet] High-Voltage 1-A Step-Down Switching Regulator
	LM5010SD	1Mb / 26P	[Old version datasheet] High-Voltage 1-A Step-Down Switching Regulator
	LM2575	171Kb / 10P	[Old version datasheet] 1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATOR
	LM5010MH	1Mb / 24P	[Old version datasheet] High-Voltage 1-A Step-Down Switching Regulator
	LM5010A	1Mb / 27P	[Old version datasheet] High-Voltage 1-A Step-Down Switching Regulator
IK Semicon Co., Ltd	IL2575-XX	761Kb / 17P	1.0 A, 15 V, Step-Down Switching Regulator