ILD2111
Digital DC/DC Controller with I-Set
Product highlights
Assumes control of functionality where a
microcontroller is required in conventional
systems
Device configurable by a comprehensive
parameter set
High efficiency over wide input and output
ranges
High accuracy of +/-5% over output current
range and useful temperature
PG-DSO-8-58
Integrated electronic control gear for LED
luminaires
Features
Hysteretic current regulation
Output current adjustable in up to 16 steps with
a dynamic range of 1:4 between min. and max.
configurable by an external resistor
Flicker-free and phase-aligned PWM dimming
based on input PWM signal
Fully configurable internal and external smart
overtemperature protection
Open/short load protection
Overpower protection
Description
The
ILD2111
is
a
high-performance
microcontroller-based digital DC/DC buck LED
controller, designed as a constant current source.
The driving current is adjustable with a simple
external resistor. Flicker-free dimming supported by
means of phase-aligned PWM LED current. An
ASSP digital microcontroller-based engine is highly
configurable using a comprehensive parameter set
to provide fine tuning of operation and protection
features. High-precision hysteretic output current
regulation is achieved thanks to the digital control
loops.
Applications
LED drivers, e.g. 2-stage professional lighting
systems
VIN
5
LEDs
GD0
4
3
Line Voltage
PFC+Flyback
VCC
GND
7
8
2
ILD2111
DC/DC Buck
REF/SC
CS
MOSFET
BSP373
L6327
Current
Control
Rext
VDDP
Temperature
Control
ZD2V7
6
PTC
1
PWM
TS
PWM - Dimming
GND
UART Interface
Configuration &
In-Circuit Calibration
External
PWM Signal
Figure 1. Typical Application
Product type
ILD2111
Datasheet
Package
PG-DSO-8-58
2
Revision 1.0, 2015-04-08
ILD2111
Table of Contents
Table of Contents
1
2
3
3.1
3.2
3.3
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.4
3.4.1
3.4.2
3.5
3.6
3.6.1
3.6.2
3.6.3
3.6.4
3.6.5
3.6.6
3.6.7
3.6.8
3.6.9
3.7
3.8
3.9
3.9.1
3.9.2
4
4.1
4.2
4.3
4.4
4.5
5
Pin Configuration and Description ................................................................................................... 4
Block Diagram .................................................................................................................................... 5
Functional Description ...................................................................................................................... 6
Introduction ........................................................................................................................................... 6
Main Supply (VCC)............................................................................................................................. 11
Controller Features............................................................................................................................. 11
Configurable Leading Edge Blanking (LEB) and Sampling Time at Pin CS ...................................... 12
Configurable Gate Driver Output ........................................................................................................ 12
Reference Current Setup ................................................................................................................... 13
Output Current Control and Measuring .............................................................................................. 17
Current Startup, Soft-Start and Shutdown Control ............................................................................. 19
Current Ripple vs. Switching Frequency Control Scheme ................................................................. 20
Fixed Current Ripple .......................................................................................................................... 20
Frequency and Ripple Control ........................................................................................................... 21
Input Voltage Measurement and Calibration ...................................................................................... 28
Protection Features ............................................................................................................................ 30
Undervoltage Protection for DC Input Line – V
IN
Undervoltage ......................................................... 32
Overvoltage Protection for DC Input Line – V
IN
Overvoltage ............................................................. 32
Output Undervoltage Protection – V
OUT
Undervoltage ....................................................................... 32
Open Output Protection ..................................................................................................................... 32
Output Overvoltage Protection – V
OUT
Overvoltage ........................................................................... 33
Output Overpower Protection – P
OUT
Overpower .............................................................................. 33
Overtemperature Protection ............................................................................................................... 34
Overcurrent Protection – Level 2 (OCP2) .......................................................................................... 39
Functional Protections ........................................................................................................................ 39
External PWM Dimming ..................................................................................................................... 40
Output Current PWM Modulation ....................................................................................................... 41
Configuration ...................................................................................................................................... 42
Overview of Configurable Parameters ............................................................................................... 42
Configuration Procedure – Parameter Handling ................................................................................ 52
Electrical Characteristics ................................................................................................................ 54
Definitions ........................................................................................................................................... 54
Absolute Maximum Ratings ............................................................................................................... 55
Package Characteristics .................................................................................................................... 56
Operating Conditions ......................................................................................................................... 56
DC Electrical Characteristics .............................................................................................................. 57
Outline Dimensions ......................................................................................................................... 63
Datasheet
3
Revision 1.0, 2015-04-08
ILD2111
Pin Configuration and Description
1
Pin Configuration and Description
The pin configuration is shown in
Figure 2
and
Table 1-1.
The pin functions are described later.
TS
REF/SC
CS
GD0
1
2
3
4
8
7
6
5
GND
VCC
PWM
VIN
PG-DSO-8-58 (150mil)
Figure 2. Pin Configuration
Table 1-1. Pin Definitions and Functions
Symbol
TS
Pin
1
Type
I
Function
Temperature Sensor
The pin TS is used for external temperature measurement using PTC or an
appropriate passive temperature sensor.
Reference/Serial Communication
The pin REF/SC is multiplexed. During startup it is used for reference current
sensing by means of an external RC circuit. Afterwards, it serves as a UART
serial communication interface.
Current Sense
Current measurement on an external shunt resistor.
Gate Driver Output 0
Output for directly driving a power MOS.
Voltage Input
Voltage input measurement. Requires an external series resistor for voltage
sensing and current limitation.
PWM Dimming Signal
Input for PWM-based dimming signal.
Positive Voltage Supply
IC power supply.
Power and Signal Ground
REF/SC
2
IO
CS
GD0
VIN
3
4
5
I
O
I
PWM
VCC
GND
6
7
8
I
I
O
Datasheet
4
Revision 1.0, 2015-04-08
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