Microchip MIC3202-1 Handleiding

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MIC3202/MIC3202-1
High-Brightness LED Driver with
Integrated MOSFET and High-Side
Current Sense
944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.comMicrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408)
Septembe M9999-091710-A
r 2010
General Description
The MIC3202 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 MIC3202 is well suited for lighting applications
requiring 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 amplifier delivers LED
current with ±5% accuracy. An external high-side current-
sense resistor is used to set the output current.
The MIC3202 offers a dedicated PWM input (DIM) which
enables a wide range of pulsed dimming. High-frequency
switching operation of up to 1MHz allows the use of
smaller external components, minimizing space and cost.
The MIC3202 offers a frequency dither feature for low-EMI
applications.
The MIC3202 operates over a junction temperature from
− ° + °40 C to 125 C and is available in an 8-pin e-PAD SOIC
package.
A dither disabled version MIC3202-1 is also available in
the same package as the MIC3202.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• 6V to 37V input voltage range
• > High efficiency ( 90%)
• ± 5% LED current accuracy
• MIC3202: Dither enabled for low EMI
• MIC3202-1: Dither disabled
• High-side current sense (up to 1A)
• Dedicated dimming control input
• Hysteretic control (no compensation required)
• Up to 1MHz switching frequency
• Adjustable constant LED current
• Over-temperature 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)
_________________________________________________________________________________________________________________________
Typical Application
MIC3202 Step-Down LED Driver
Efficiency
vs. Input Voltage
80
85
90
95
100
6 14 22 30 38
INPUT VOLTAGE (V)
EFFICIENCY (%)
I
LED
= 1A
L = 47uH
8LED6LED
4LED
2LED
Micrel, Inc. MIC3202/MIC3202-1
September 2010 2 M9999-091710-A
Ordering Information (1)
Part Number Marking Junction Temperature Range Package PWM
MIC3202YME MIC3202YME − +40°C to 125°C 8-Pin SOIC Dither
MIC3202-1YME MIC3202-1YME − +40°C to 125°C 8-Pin SOIC Non-Dither
Note:
1. YM® is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
8-Pin ePAD SOIC
MIC3202/MIC3202-1
Pin Description
Pin
Number Pin Name Pin Function
1 VCC
Voltage Regulator Output. The VCC pin supplies the power to the internal circuitry. The VCC is the output
of a linear regulator which is powered from VIN. A 1µF ceramic capacitor is recommended for bypassing
and should be placed as close as possible to the VCC and AGND pins.
2 CS Current-Sense Input. The CS pin provides the high-side current sense to set the LED current using an
external sense resistor.
3 VIN
Input Power Supply. The VIN pin is the input supply pin to the internal circuitry and the positive input to
the current sense comparator. Due to the high frequency switching noise, a 1µF ceramic capacitor is
recommended to be placed as close as possible to VIN pin and the power ground (PGND) pin for
bypassing. Please refer to layout recommendations.
4 AGND Ground pin for analog circuitry. Internal signal ground for all low power sections.
5 EN
Enable Input. The EN pin provides a logic level control of the output. The voltage has to be 2.0V or higher
to enable the current regulator. the DIM input. When the EN pin is The output stage is also gated by
pulled low, the regulator goes to off state and the supply current of the device is greatly reduced (below
1µA).
6 DIM
PWM Dimming Input. The DIM pin provides the control for brightness of the LED. A PWM input can be
used to control the brightness of LED. DIM high enables the output and its voltage has to be at least 2.0V
or higher. DIM low disables the output, regardless of EN “high” state.
7 PGND
Power Ground pin for Internal Power FET. Power Ground (PGND) is the ground path for the high current.
The current loop for the power ground should be as small as possible and separate from the Analog
ground (AGND) loop. Refer to the layout considerations for more details.
8 LX
Drain of Internal Power MOSFET. The LX pin connects directly to the inductor and provides the switching
current necessary to operate in hysteretic mode. Due to the high frequency switching and high voltage
associated with this pin, the switch node should be routed away from sensitive nodes.
EP GND Connect to PGND.
Micrel, Inc. MIC3202
September 2010 3 M9999-091710-A
Absolute Maximum Ratings (1, 2)
VIN to PGND .................................................. −0.3V to +42V
VLX to PGND........................................ −0.3V to (VIN + 0.6V)
VCS to PGND ....................................... −0.3V to (VIN + 0.3V)
VEN to AGND ....................................... −0.3V to (VIN + 0.3V)
VDIM to AGND ...................................... −0.3V to (VIN + 0.3V)
VCC to PGND ................................................ −0.3V to +6.0V
PGND to AGND .......................................... −0.3V to 0.3V +
Junction Temperature ................................................ 150°C
Storage Temperature Range .................... −60°C to + °150 C
Lead Temperature (Soldering, 10sec) ....................... 260°C
Operating Ratings (3)
Supply Voltage (VIN).......................................... 6.0V to 37V
Enable Voltage (VEN) .............................................. 0V to V
IN
Dimming Voltage (VDIM).................................................................
0V to VIN
Junction Temperature (TJ) ........................ −40°C to + °125 C
Junction Thermal Resistance
SOIC (θJA) ..........................................................41°C/W
SOIC (θJC).......................................................14.7°C/W
Electrical Characteristics (4)
VIN
= VEN = VDIM = 12V; CVCC = 1.0µF; TJ = 25°C, bold values indicate − ° ≤40 C TJ ≤ +125°C; unless noted.
Symbol Parameter Condition Min. Typ. Max. Units
Input Supply
VIN Input Voltage Range (VIN ) 6.0 37.0 V
IS Supply Current LX Pin = open 1.2 1.75 mA
ISD Shut Down Current VEN = 0V; TJ
= from -40ºC to 85ºC 0.05 5 µA
UVLO VIN UVLO Threshold VIN Rinsing 3.2 4 4.5 V
UVLOHYS VIN UVLO Hysteresis 500 mV
VCC Supply
VCC VCC Output Voltage V
CS = VIN = 12V, ICC = 10mA 4.5 5 5.5 V
Current Limit
VCS(MAX)
Current-Sense Upper Threshold VCS(MAX ) = VIN − VCS
199 212 225 mV
VCS(MIN) Current-Sense Lower Threshold VCS(MIN ) = VIN
− VCS 165 177 189 mV
VCS Hysteresis 35 mV
VCS Rising 60
Current-Sense Response Time VCS Falling 40 ns V CSHYS
Current-Sense Input Current V
IN - VCS = 200mV 3 µA
Frequency
FMAX Maximum Switching Frequency 1 MHz
Dithering (MIC3202)
VDITH VCS Hysteresis Dithering Range(5) ±6 mV
FDITHER Frequency Dithering Range(5) % of Switching Frequency ±12 %
Enable Input
ENHI EN Logic Level High 2.0 V
EN Logic Level Low 0.4 V
VEN = 12V 30 60
EN Bias Current VEN = 0V 0.1 1 µA
ENLO
Start-up Time From EN Pin going high to LX
going low 30 µs

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: MIC3202-1

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