LED5000PHR STMicroelectronics, LED5000PHR Datasheet - Page 13

• Manufacturer Part Number: LED5000PHR
• Description: Current & Power Monitors & Regulators 3A monolithic Conv 850kHz Synch
• Manufacturer: STMicroelectronics

Specifications of LED5000PHR

• Rohs: yes
• Product: Current Regulators
• Supply Voltage - Max: 48 V
• Supply Voltage - Min: 5.5 V
• Operating Temperature Range: - 40 C to + 150 C
• Mounting Style: SMD/SMT
• Package / Case: HPSO-8
• Accuracy: +/- 3 %
• Input Voltage Range: 5.5 V to 48 V
• Output Current: 23 uA
• Sensing Method: High or Low Side
• Supply Current: 1.7 mA

LED5000
5
5.1
5.2
Application notes - buck conversion
Closing the loop
Figure 6.
G
The accurate control to output transfer function for a buck peak current mode converter can
be written as:
Equation 1
where R
resistor of the current sense circuitry,
zero given by the ESR of the output capacitor.
F
error amplifier that introduces a double pole at one half of the switching frequency.
H
CO
(s) accounts the sampling effect performed by the PWM comparator on the output of the
(s) control to output transfer function
LOAD
G
comparator
CO
Current sense
PWM control
PWM
Block diagram of the loop
represents the load resistance (see
s
=
-
+
R
----------------- -
R
LOAD
CS
V
CONTROL
------------------------------------------------------------------------------------------------ -
1
Doc ID 023951 Rev 1
+
R
------------------------- -
0
L
V
T
IN
switch
switch
SW
p
HS
LS
the single pole introduced by the LC filter and
R
C
m
1
C
C
C
Chapter 5.4
compensation
1 D
amplifier
–
Application notes - buck conversion
network
error
L
–
0.5
LC filter
), R
-
+
-------------------- -
1
1
V
FB
CS
REF
+
+
C
---- -
-----
the equivalent sensing
s
s
OUT
z
p
G
V
A
CO
OUT
O
(s)
(s)
F
H
s
LED
R
AM13490v1
S
z
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the