Microchip MIC3232 Handleiding

Microchip Niet gecategoriseerd MIC3232

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MIC3230/1/2
Constant Current Boost Controller for
Driving High Power LEDs
Bringing the Power to Light is a trademark of Micrel, Inc.
MicroLeadFrame and MLF are registered trademarks of Amkor Technology.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 2011
M9999-030311-D
General Description
The MIC3230/1/2 are constant current boost switching
controllers specifically designed to power one or more
strings of high power LEDs. The MIC3230/1/2 have an
input voltage range from 6V to 45V and are ideal for a
variety of solid state lighting applications.
The MIC3230/1/2 utilizes an external power device which
offers a cost conscious solution for high power LED
applications. The powerful drive circuitry can deliver up to
70W to the LED system. Power consumption has been
minimized through the implementation of a 250mV
feedback voltage reference providing an accuracy of ±3%.
The MIC323x family is dimmable via a pulse width
modulated (PWM) input signal and also features an enable
pin for low power shutdown.
Multiple MIC3230 ICs can be synchronized to a common
operating frequency. The clocks of these synchronized
devices can be used together in order to help reduce noise
and errors in a system.
An external resistor sets the adjustable switching
frequency of the MIC3230/1. The switching frequency can
be between 100kHz and1MHz. Setting the switching
frequency provides the mechanism by which a design can
be optimized for efficiency (performance) and size of the
external components (cost). The MIC323x family of LED
drivers also offer the following protection features: Over
voltage protection (OVP), thermal shutdown and under-
voltage lock-out (UVLO).
The MIC3231 offers a dither feature to assist in the
reduction of EMI. This is particularly useful in sensitive EMI
applications, and provides for a reduction or emissions by
approximately 10dB.
The MIC3232 is a 400kHz fixed frequency device offered
in a small 10-pin MSOP package. The MIC3230/1 are
offered in both the EPAD 16-pin TSSOP package and the
12-pin 3mm × 3mm MLF® package.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Bringing the Power to Lightâ„¢
Features
• 6V to 45V input supply range
• Capable of driving up to 70W
• Ultra low EMI via dithering on the MIC3231
• Programmable LED drive current
• Feedback voltage = 250mV ±3%
• Programmable switching frequency (MIC3230/1) or
400kHz fixed frequency operation (MIC3232)
• PWM Dimming and separate enable shutdown
• Frequency synchronization with other MIC3230s
• Protection features:
Over Voltage Protection (OVP)
Over temperature protection
Under-voltage Lock-out (UVLO)
• Packages:
IADJ IS65
1VIN
EN
PWMD
COMP
10 VDD
DRV
PGND
OVP
9
8
7
2
3
4
IADJ IS
VIN
EN
PWMD
COMP
1 VDD
DRV
PGND
OVP
2
3
4
5
FS EPAD SYNC/NC6
8
12
11
10
9
7
1N/C
VIN
EN
PWMD
COMP
IADJ
FS
AGND
16 N/C
VDD
DRV
PGND
OVP
IS
SYNC/NC
N/C
15
14
13
12
11
10
9
2
3
4
5
6
7
8EPAD
MIC3232
10-pin MSOP
MIC3230/1
12-pin MLF®
MIC3230/1
16-pin TSSOP
• –40°C to +125°C junction temperature range
Applications
• Street lighting
• Solid state lighting
• General illumination
• Architectural lighting
• Constant current power supplies
Micrel, Inc. MIC3230/1/2
March 2011 2 M9999-030311-D
Typical Application
L
47µH D1
R8
100k
R9
4.33k
COUT
4.7µF
100V
R2
100k
RADJ
1/4W
RFS
16.5k CCOMP
10nF
CIN
4.7µF/50v
RSLC
51
VFB = 0.25V RCS
1/2W
Analog ground Power ground
VOUTVIN
PWMD
ENABLE
Synch to other MIC3230
ILED Return
LED 1
LED XQ1
COMP
PWMD
VDD
AGND PGND
EPAD
IS
OVP
DRV
VIN
EN
IADJ
MIC3230/31
SYNC
FS
C3
10µF
10V
Figure 1. Typical Application of the MIC3230 LED Driver
Product Option Matrix
MIC3230 MIC3231 MIC3232
Input Voltage 6V to 45V 6V to 45V 6V to 45V
Synchronization Yes No No
Dither No Yes No
Frequency Range Adj from 100kHz to 1MHz Adj from 100kHz to 1MHz Fixed Freq. = 400kHz
Package 16-pin EPAD TSSOP
12-pin 3mm × 3mm MLF®
16-pin EPAD TSSOP
12-pin 3mm × 3mm MLF® 10-pin MSOP
Ordering Information
Part Number Temperature Range Package Lead Finish
MIC3230YTSE –40° to +125°C 16-pin EPAD TSSOP Pb-Free
MIC3230YML –40° to +125°C 12-pin 3mm x 3mm MLF® Pb-Free
MIC3231YTSE –40° to +125°C 16-pin EPAD TSSOP Pb-Free
MIC3231YML –40° to +125°C 12-pin 3mm x 3mm MLF® Pb-Free
MIC3232YMM –40° to +125°C 10-pin MSOP Pb-Free
Micrel, Inc. MIC3230/1/2
March 2011 3 M9999-030311-D
Pin Configuration
IADJ IS65
1VIN
EN
PWMD
COMP
10 VDD
DRV
PGN
D
OVP
9
8
7
2
3
4
IADJ IS
VIN
EN
PWMD
COMP
1 VDD
DRV
PGND
OVP
2
3
4
5
FS EPAD SYNC/NC6
8
12
11
10
9
7
1N/C
VIN
EN
PWMD
COMP
IADJ
FS
AGND
16 N/C
VDD
DRV
PGND
OVP
IS
SYNC/NC
N/C
15
14
13
12
11
10
9
2
3
4
5
6
7
8EPAD
10-Pin MSOP (MM)
MIC3232
12-Pin 3mmx3mmMLF® (ML)
MIC3230, MIC3231
See Product Option Matrix for selection
16-Pin TSSOP (TSE)
MIC3230, MIC3231
See Product Option Matrix for selection
Pin Description
Pin Number
MLF®
Pin Number
TSSOP
Pin Number
MSOP
Pin Name Pin Function
-- 1 -- NC No Connect.
1 2 1 VIN Input Voltage (power) 6V to 45V.
2 3 2 EN Enable Control (Input). Logic High ( 1.5V) enables the ≥
regulator. Logic Low (≤0.4V) shuts down the regulator.
Connect a 100kΩ resistor from EN to VIN.
3 4 3 PWMD PWM Dimming Input. Logic Low will disable the brightness
control of the LED drivers.
4 5 4 COMP Compensation (output): for external compensation.
5 6 5 IADJ Feedback (input).
6 7 -- FS Frequency Select (input). Connected to a Resistor to
determine the operating frequency.
-- 8 -- AGND Analog Ground.
-- 9 -- NC No Connect.
7 10 -- SYNC Sync (output). Connect to another MIC3230 to synchronize
multiple converters.
8 11 6 IS Current Sense (input). Connected to external current sense
resistor which in turn is connected to the source of the external
FET as well as an external slope compensation resistor.
9 12 7 OVP OVP divider connection (output). Connect the top of the
divider string to the output. If the load is disconnected, the
output voltage will rise until OVP reaches 1.25V and then will
regulate around this point.
10 13 8 PGND Power Ground.
11 14 9 DRV Drive Output: connect to the gate of external FET (output).
12 15 10 VDD VDD Filter for internal power rail. Do not connect an external
load to this pin. Connect 10µF to GND.
-- 16 -- NC No Connect.
-- -- -- EPAD Connect to AGND.

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: MIC3232

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