Microchip MIC4801 Handleiding


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MIC4801
High Efficiency 600mA Single Channel
Linear WLED Driver with
Ultra Fast PWMâ„¢ Control
Ultra Fast PWM is a trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
January 2011 M9999-011811-A
General Description
The MIC4801 is a high efficiency White LED (WLED)
driver designed to drive a single LED up to 600mA. The
MIC4801 constant current driver is designed to drive high
power LED’s in various lighting applications. The MIC4801
provides the highest possible efficiency as this architecture
has no switching losses present in traditional charge
pumps or inductive boost circuits. It features a typical
dropout of 130mV at 400mA. This allows the LEDs to be
driven directly from the voltage source eliminating
switching noise/losses present with the use of boost
circuitry. The high accuracy (±1% typical) current regulated
WLED channel ensures uniform display illumination under
all conditions. The brightness is controlled through an Ultra
Fast PWMâ„¢ Control interface operating down to less than
1% duty cycle.
The MIC4801 is available in an 8-pin SOIC package with a
junction temperature range of -40° °C to +125 C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• High Efficiency (no Voltage Boost losses)
• Ultra Fast PWM™ control (200Hz to 500kHz)
• Input voltage range: 3.0V to 5.5V
• Dropout of 130mV at 400mA
• Programmable LED current with external resistor
• Current accuracy of ±1% typical
Applications
• Bill board displays
• Marquee displays
• Instrument displays
• Architectural lighting
____________________________________________________________________________________________________________
Typical Application
High Current Lighting Schematic
Micrel Inc. MIC4801
January 2011 2 M9999-011811-A
Ordering Information
Part Number Temperature Range Package
MIC4801YM –40°C to +125°C 8-Pin SOIC
Pin Configuration
8-Pin SOIC (M)
(Top View)
Pin Description
Pin Number Pin Name Pin Function
1 VIN Voltage Input. Connect at least 2.2µF ceramic capacitor between VIN and GND.
2 EN Enable LED drivers. This pin can be used as a PWM input for dimming of WLEDs. Do not leave
floating.
3 RSET An internal 1.27V reference sets the nominal maximum WLED current. Example, apply a 12.1kΩ
resistor between RSET and GND to set LED current to 416mA at 100% duty cycle.
4 GND Ground.
5 D1 LED1 driver input. Connect LED anode to VIN and cathode to this pin. All D1 pins must be
connected to the LED.
6 D1 LED1 driver input. Connect LED anode to VIN and cathode to this pin. All D1 pins must be
connected to the LED.
7 D1 LED1 driver input. Connect LED anode to VIN and cathode to this pin. All D1 pins must be
connected to the LED.
8 D1 LED1 driver input. Connect LED anode to VIN and cathode to this pin. All D1 pins must be
connected to the LED.
Micrel Inc. MIC4801
January 2011 3 M9999-011811-A
Absolute Maximum Ratings(1)
Main Input Voltage (VIN) .................................. –0.3V to +6V
Enable Input Voltage (VEN).............................. –0.3V to +6V
LED Driver Voltage (VD1) ................................ –0.3V to +6V
Power Dissipation .....................................Internally Limited
Lead Temperature (soldering, 10sec.)....................... 260°C
Storage Temperature (Ts) .........................–65°C to +150°C
Operating Ratings(2)
Supply Voltage (VIN)..................................... +3.0V to +5.5V
Enable Input Voltage (VEN) .................................... 0V to V
IN
LED Driver Voltage (VD1) ....................................... 0V to VIN
Junction Temperature (TJ) ........................ –40°C to +125°C
Junction Thermal Resistance
SOIC-8L (θJA)..................................................98.9°C/W
Electrical Characteristics
VIN = VEN = 5V, RSET = 12.1kΩ; VD1 = 1.2V; TJ = 25° °C, bold values indicate –40 C ≤ TJ ≤ 125°C; unless noted.
Parameter Conditions Min Typ Max Units
Current Accuracy(3) 374 416 458 mA
Drop-out Where ILED = 90% of LED current seen at
VDROPNOM = 1.2V, 100% brightness level 130 250 mV
Ground/Supply Bias Current IOUT = 416mA 2.2 2.9 mA
Shutdown Current VEN = 0V 0.01 1 µA
PWM Dimming
Logic Low 0.2 V Enable Input Voltage (V
EN)
Logic High 1.2 V
Enable Input Current VIH > 1.2V 0.01 1 µA
Current Source Delay
(50% levels)
Shutdown to on
Standby to on
On to Standby
40
2
0.3
60 µs
µs
µs
Current Source Transient Time
(10%-90%)
TRISE
TFALL
1
0.3
µs
µs
Stand-by to Shutdown Time VEN = 0V 10 20 40 ms
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. As determined by average current based on R
SET resistance.
Micrel Inc. MIC4801
January 2011 10 M9999-011811-A
MIC4801 Typical Application Circuit
Bill of Materials
Item Part Number Manufacturer Description Qty.
C1608X5R0J225K TDK(1)
06036D225KAT2A AVX
(2)
GRM188R60J225KE19D Murata(3)
C1
VJ0603G225KXYAT Vishay(4)
Ceramic Capacitor, 2.2µF, 6.3V, X5R, Size 0603 1
LED R42180 Seoul Semiconductor(5) 3.8W High Power WLED 1
R1 CRCW060312K1FKEA Vishay(4) Resistor, 1%, 1/16W, Size 0603 1
U1 MIC4801YM Micrel, Inc.(6) 600mA Single Channel Ultra Fast PWMâ„¢
Linear WLED Driver 1
Notes:
1. TDK: www.tdk.com
2. AVX: www.avx.com
3. Murata: www.murata.com
4. Vishay: www.vishay.com
5. Seoul Semi: http://www.acriche.com/en
6. Micrel, Inc.: www.micrel.com
Micrel Inc. MIC4801
January 2011 12 M9999-011811-A
Package Information
8-Pin SOIC (M)
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty of Micrel products including lrelating to the sale and/or use iability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or system ended for surgical implant s are devices or systems that (a) are int
into the body or (b) support or sustain life, and whose failure t injury to the user. A to perform can be reasonably expected to result in a significan
Purchaser’s use or sale of Micrel Produc Purchaser agrees to fully ts for use in life support appliances, devices or systems is a Purchaser’s own risk and
indemnify Micrel for any damages resulting from such use or sale.
© 2010 Micrel, Incorporated.


Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: MIC4801

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