TPS92515 datasheet(23/39 Pages) TI1

부품명	TPS92515

상세설명	2-A, Buck LED Driver with Integrated N-channel FET,High-Side Current Sense, and Shunt FET PWM Dimming Capability

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LED

OFF

SW

IN MIN

IN PP

1

I

x

t

f

C

V

ª

º

«

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'

IADJ

SENSE

L PP

LED

V

10

R

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IADJ

PEAK

SENSE

V

10

IL

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LED

OFF

L PP

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x t

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OFT

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OFF

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t

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23

TPS92515, TPS92515-Q1, TPS92515HV, TPS92515HV-Q1

www.ti.com

SLUSBZ6A – APRIL 2016 – REVISED AUGUST 2016

Product Folder Links: TPS92515 TPS92515-Q1 TPS92515HV TPS92515HV-Q1

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Typical Application (continued)

derived from:

•

T = [tOFF + tON ]= [tOFF+ (D × T)] and

•

T = 1/fSW

(16)

9.2.1.3 Calculate OFF-Time Resistor ROFF

Select a COFF between 100 pF and 1 nF. The preferred value is 470 pF. The EC table specifies the OFF-time

threshold (VOFT) at 1 V.

(17)

9.2.1.4 Calculate the Minimum Inductance Value

Where ΔIL-PP is in Amperes. For example, a 1-A solution with 20% inductor ripple: set ΔIL-PP = 0.2A

(18)

When selecting the inductor, ensure the ratings for both peak and average current are adequate. Equation 19

calculates the peak inductor current.

(19)

9.2.1.5 Calculate the Sense Resistance

Always use the highest VIADJ voltage the application allows without exceeding 5.5 V. The device clamps any

higher value to a level 2.4 V. See also the Analog Adjust Input for details.

(20)

9.2.1.6 Calculate Input Capacitance

NOTE

Input voltage ripple (ΔVIN-PP) must not exceed 10% of the input voltage (VIN) or 2 V,

whichever is lower.

For example, VIN = 50 V, 50 x 0.1 = 5 V; the maximum ΔVIN-PP remains 2 V.

(21)

9.2.1.7 Calculate Output Capacitance

Because current is being regulated and is continuous, no output capacitance is required to supply the load and

maintain output voltage. This regulation helps when designing a high-frequency PWM dimming on the LED load.

When no output capacitor is used, the same design calculations for ΔIL-PP also apply to ΔILED-PP.

유사한 부품 번호 - TPS92515

제조업체	부품명	데이터시트	상세설명
Texas Instruments	TPS92515AHV-Q1	1Mb / 38P	[Old version datasheet] 2-A, Buck LED Driver with Integrated N-channel FET, High-Side Current Sense, and Shunt FET PWM Dimming Capability
	TPS92515AHVQDGQRQ1	1Mb / 38P	[Old version datasheet] 2-A, Buck LED Driver with Integrated N-channel FET, High-Side Current Sense, and Shunt FET PWM Dimming Capability
	TPS92515AHVQDGQTQ1	1Mb / 38P	[Old version datasheet] 2-A, Buck LED Driver with Integrated N-channel FET, High-Side Current Sense, and Shunt FET PWM Dimming Capability

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유사한 설명 - TPS92515

제조업체	부품명	데이터시트	상세설명
Texas Instruments	TPS92515AHV-Q1	1Mb / 38P	[Old version datasheet] 2-A, Buck LED Driver with Integrated N-channel FET, High-Side Current Sense, and Shunt FET PWM Dimming Capability
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유사한 부품 번호 - TPS92515

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