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PDF ILD1151 Data sheet ( Hoja de datos )
| Número de pieza | ILD1151 | |
| Descripción | Multitopology High Power LED DC/DC Controller | |
| Fabricantes | Infineon | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ILD1151 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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ILD1151
Multitopology High Power LED DC/DC
Controller for Industrial Applications
Datasheet
Rev. 1.1, 2012-04-11
1 page  
2 Block Diagram
ILD1151
Block Diagram
IN 14
EN / PWMI 13
On/Off
Logic
Internal
Supply
LDO
EN_INT/
PWM_INT
1 IVCC
Power On
Reset
FREQ / SYNC 11
Oscillator
Soft
Start
Slope
Comp.
Thermal
Protection
Open Load
+ Short to GND detection
SET 10
COMP 8
Reference
Current
Generation
PWM
Generator
Power Switch
Gate Driver
Switch Current
Error Amplifier
Leading Edge
Blanking
Over Volage
Protection
2 SWO
4 SWCS
3 SGND
9 OVFB
Feedback Voltage
Error Amplifier
6 FBH
7 FBL
Figure 1 Block Diagram
12
GND
EN_INT/
PWM_INT
Dimming Switch
Gate Driver
5 PWMO
Datasheet
5 Rev. 1.1, 2012-04-11
5 Page 
ILD1151
Switching Regulator
5 Switching Regulator
5.1 Description
The ILD1151 regulator is suitable for Boost, Buck, Buck-Boost, SEPIC and Flyback configurations. The constant
output current is especially useful for light emitting diode (LED) applications. The regulator function is implemented
by a pulse width modulated (PWM) current mode controller.
The PWM current mode controller uses the peak current through the external power switch and error in the output
current to determine the appropriate pulse width duty cycle (on time) for constant output current. The current mode
controller provides a PWM signal to an internal gate driver which then outputs to an external n-channel
enhancement mode metal oxide field effect transistor (MOSFET) power switch.
The current mode controller also has built-in slope compensation to prevent sub-harmonic oscillations which is a
characteristic of current mode controllers operating at high duty cycles (>50% duty).
An additional built-in feature is an integrated soft start that limits the current through the inductor and external
power switch during initialization. The soft start function gradually increases the inductor and switch current over
tSS (Parameter 5.2.8) to minimize potential overvoltage at the output.
OVFB 9
COMP 8
OV FB
VRef =
1.25V
H when
OVFB >1.25V
FBH 6
x1
EA
FBL 7
SET 10
0 if SET < 1.6V
0
VVRef 1
(SET − 0.1V ) = VRef
5 0.3V
Soft start
gmEA
I EA
Current
Comp High when
lEA- ISLOPE- ICS > 0
OFF
when H
&Low when
Tj > 175 °C
R
Q
FREQ/
SYNC
11
Oscillator
I Slope Comp
t
Clock
S& Q
Error -FF
High when
IVCC < 4.0V
UV IVCC
= VRef
NOR 4.0V
> Output Stage
OFF when
1 Low
R
&
Q
INV
1
Gate Driver
Supply
Gate
Driver
NAND 2
&
S& Q
PWM-FF
Current
Sense
ICS
1 IVCC
2 SWO
4 SWCS
3 SGND
Figure 3 Switching Regulator Block Diagram
Datasheet
11 Rev. 1.1, 2012-04-11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ILD1151.PDF ] | |
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