Microchip MIC3203 Bedienungsanleitung


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2019 Microchip Technology Inc. DS20006250A-page 1
MIC3203/MIC3203-1
Features
4.5V to 42V Input Voltage Range
High Efficiency (>90%)
±5% LED Current Accuracy
MIC3203: Dither Enabled for Low EMI
MIC3203-1: Dither Disabled
High-Side Current Sense
Dedicated Dimming Control Input
Hysteretic Control (No Compensation)
Up to 1.5 MHz Switching Frequency
Adjustable Constant LED Current
Overtemperature Protection
–40°C to +125°C Junction Temperature Range
Applications
Architectural, Industrial, and Ambient Lighting
LED Bulbs
Indicators and Emergency Lighting
Street Lighting
Channel Letters
12V Lighting Systems (MR-16 Bulbs,
Under-Cabinet Lighting, Garden/Pathway
Lighting)
General Description
The MIC3203 is a hysteretic, step-down,
constant-current, high-brightness LED (HB LED)
driver. It provides an ideal solution for interior/exterior
lighting, architectural and ambient lighting, LED bulbs,
and other general illumination applications.
The MIC3203 is well suited for lighting applications that
require a wide input voltage range. The hysteretic
control gives good supply rejection and fast response
during load transients and PWM dimming. The
high-side current sensing and on-chip current-sense
comparator delivers LED current with ±5% accuracy.
An external high-side current-sense resistor is used to
set the output current.
The MIC3203 offers a dedicated PWM input (DIM) that
enables a wide range of pulsed dimming. A
high-frequency switching operation up to 1.5 MHz
allows the use of smaller external components
minimizing space and cost. The MIC3203 offers
frequency dither feature for EMI control.
The MIC3203 operates over a junction temperature
from –40°C to +125°C and is available in an 8-pin SOIC
package.
A dither disabled version MIC3203-1 is also available in
the same package as the MIC3203.
Package Type
MIC3203
8-Lead SOIC (M)
(Top View)
1VCC
CS
VIN
AGND
8 DRV
PGND
DIM
EN
7
6
5
2
3
4
High-Brightness LED Driver Controller with High-Side Current Sense
MIC3203/MIC3203-1
DS20006250A-page 2 2019 Microchip Technology Inc.
Typical Application Circuit
MIC3203
STEP OWN RIVER-D LED D
V
IN
C
IN
10μF
R
CS
R
G
D
L
1
2
3
4
5
6
7
8
C
VCC
1μF
MOSFET
MIC3203YM
MIC3203-1YM
CS
VIN
EN
DIM
DRV
VCC
AGND
PGND
LEDs
Nȍ
Functional Block Diagram
(4.5V – 42V)
C
IN
10μF
R
CS
LED1 LED2 LED3 LED4 LED5 LED6
VIN
EN
CS
DIM
D
L
5V
REGULATOR
177mV
C1
C2
35mV
DITHER
MIC3203 ONLY
THERMAL
SHUTDOWN
FF
S
R
Q
UVLO
VCC
C
VCC
10μF
DRV
R
G
Nȍ
PGND
SGND
2019 Microchip Technology Inc. DS20006250A-page 3
MIC3203/MIC3203-1
1.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
VIN to PGND .............................................................................................................................................. –0.3V to +45V
VCC to PGND ............................................................................................................................................ 0.3V to +6.0V
CS to PGND.................................................................................................................................... –0.3V to (V
IN + 0.3V)
EN to AGND.................................................................................................................................... –0.3V to (V
IN + 0.3V)
DIM to AGND .................................................................................................................................. 0.3V to (V
IN + 0.3V)
DRV to PGND ................................................................................................................................ –0.3V to (V
CC + 0.3V)
PGND to AGND........................................................................................................................................–0.3V to +0.3V)
ESD Rating (Note 1) ..................................................................................................................................... 1.5 kV, HBM
ESD Rating (Note 1) ......................................................................................................................................... 200V, MM
Operating Ratings ††
Supply Voltage (VIN) .................................................................................................................................. +4.5V to +42V
Enable Input Voltage (V
EN) ................................................................................................................................ 0V to V
IN
Dimming Input Voltage (VDIM)............................................................................................................................ 0V to V
IN
Notice: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of the device at those or any other conditions above those indicated
in the operational sections of this specification is not intended. Exposure to maximum rating conditions for extended
periods may affect device reliability.
†† Notice: The device is not guaranteed to function outside its operating ratings.
Note 1: Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5 kΩ in series
with 100 pF.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics: VIN = VEN = VDIM = 12V; CVCC = 1.0 μF; TJ = +25°C, values indicate bold
–40°C TJ +125°C unless noted. Note 1
Parameter Sym. Min. Typ. Max. Units Conditions
Input Supply
Input Voltage Range VIN 4.5 42 V —
Supply Current IS 1 mA DRV = open3
Shutdown Current ISD A V1μEN = 0V
VIN UVLO Threshold UVLO 4 V V3.2 4.5 IN rising
VIN UVLO Hysteresis UVLOHYS 500 mV —
VCC Supply
VCC Output Voltage VCC 4.5 5.55 V VIN = 12V, ICC = 10 mA
Current Sense Comparator
Current Sense Voltage Upper
Threshold VCS(MAX)
201.4 212 222.6 mV VCS(MAX) = VIN VCS
199 225212
Current Sense Voltage Lower
Threshold VCS(MIN)
168 177 186 mV VCS(MIN) = VIN
– VCS
165 189177
VCS Hysteresis VCSHYS 35 mV —
Note 1: Specification for packaged product only.
2: Guaranteed by design.


Produktspezifikationen

Marke: Microchip
Kategorie: Nicht kategorisiert
Modell: MIC3203

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