ILD4180 Infineon Technologies, ILD4180 Datasheet - Page 11

• Manufacturer Part Number: ILD4180
• Description: LED Drivers MCREL 1.8A DC/DC
• Manufacturer: Infineon Technologies
• Type: Buckr

Specifications of ILD4180

• Packages: PG-DSO-8
• Vs (min): 4.75 V
• Vs (max): 45.0 V
• Iout (typ): 1,800.0 mA
• Iout (max): 1,800.0 mA
• Lead Free Status / Rohs Status: Details
• Other names: ILD4180XT

8
Note: The following information is given as a hint for the implementation of the device only and shall not be
8.1
The stability of the output voltage can be achieved with a simple RC connected between pin COMP and GND. The
standard configuration using the switching frequency of the internal oscillator is a ceramic capacitor
and
types of buck capacitors (ceramic or tantalum).
The compensation network is essential for the control loop stability. Leaving pin COMP open might lead to an
instable operation.
8.2
The ILD4180 control loop is optimized for ceramic buck capacitors
tantalum capacitors with ESR up to 300mΩ, an additional compensation capacitance
is required. It’s value calculates:
whereas
Figure 4
8.3
In order to minimize losses and for fast recovery, a schottky freewheeling diode is required. Disconnecting the
freewheeling diode during operation might lead to destruction of the IC.
Datasheet
R
regarded as a description or warranty of a certain functionality, condition or quality of the device.
COMP
C
COMP2
= 22kΩ. By slight modifications to the compensation network the stability can be optimized for different
Application Information
Frequency Compensation
Compensating a tantalum buck capacitor
High-ESR buck capacitor compensation
Freewheeling Diode
needs to stay below 5nF.
C
COMP2
C
COMP2
C
R
COMP
COMP
=
C
BU
COMP
*
ESR
11
3
(
C
BU
ILD4180
) /
ILD5085
R
C
COMP
2
BU1
C
GND
BU
Application _C-COMP2.vsd
,
. In order to maintain stability also for
C
COMP2
Application Information
Rev. 1.1, 20011-01-25
at pin COMP to GND
C
COMP
ILD4180
= 22nF