L6995D datasheet(21/25 Pages) STMICROELECTRONICS

部件名	L6995D

功能描述	STEP DOWN CONTROLLER FOR HIGH DIFFERENTIAL INPUT-OUTPUT CONVERSION

PDF	25 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

21 / 25 page

21/25

L6995

POWER SECTION

Notes: 1. N.M.=Not Mounted

2. The demoboard with this component list is set to give: VOUT = 1.8V, FSW = 250kHz with an input voltage around VIN = 20V and

with the integrator feature.

3. The diode efficiency impact is very low; it is not a necessary component.

4. All capacitors are intended ceramic type otherwise specified.

3.11.1Efficiency

Vin = 20V Vout = 1.8V Fsw = 270kHz

Figure 18. Efficiency vs output current

Part name

Value

Dimension

Notes

C10

100nF

0603

C11

100nF

0603

DIODE

BAR18

INPUT CAPACITORS

C7, C13

µF

C34Y5U1E106ZTE12 TOKIN

OUTPUT CAPACITORS

C14, C15

330

µF

EEFUE0D331R

PANASONIC

INDUCTOR

2.7

µH

DO3316P-272HC

COILCRAFT

2.2

µH

ETQP6H2R2GF

PANASONIC

3.3

µH

DQ7545

COEV

POWER MOS

Q1,Q2

STS8DNF3LL

STMicroelectronics

Double mos in sigle package

DIODE

STPS3L40U

STMicroelectronics

0,0

0,5

1 ,0

1 ,5

2, 0

2 ,5

3,0

3 ,5

4,0

4, 5

5 ,0

5 ,5

6,0

Cu rre n t [A]

Ef f [ %]

Vin=20V Vou t=1.8V Fs w =2 70 K h z PW M

V in=20V V o ut=1 .8V Fs w =270Khz PFM

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