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LED2000DR 数据表(PDF) 13 Page - STMicroelectronics

部件名 LED2000DR
功能描述  3 A monolithic step-down current source with synchronous rectification
PDF  40 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

LED2000DR 数据表(HTML) 13 Page - STMicroelectronics

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DocID023432 Rev 4
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LED2000
Application notes
40
Equation 2
Equation 3
where:
Equation 4
Sn represents the slope of the sensed inductor current, Se the slope of the external ramp
(VPP peak-to-peak amplitude) that implements the slope compensation to avoid sub-
harmonic oscillations at duty cycle over 50%.
The sampling effect contribution FH(s) is:
Equation 5
where:
Equation 6
and
Equation 7
6.3
Error amplifier compensation network
The LED2000 device embeds (see Figure 6) the error amplifier and a pre-defined
compensation network which is effective in stabilizing the system in most application
conditions.
Z
1
ESR COUT
-------------------------------
=
P
1
RLOAD COUT
--------------------------------------
mC 1D
–
 0,5
–
LCOUT fSW

---------------------------------------------
+
=
mC
1
Se
Sn
------
+
=
Se
Vpp fSW
=
Sn
VIN VOUT
–
L
------------------------------ Ri
=
FH s

1
1
s
n QP
-------------------
s
2
n
2
------
++
-------------------------------------------
=
n
 f
SW
=
QP
1
 m
C
1D
–
 0,5
–

----------------------------------------------------------
=



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