MP3204 MPS, MP3204 Datasheet
MP3204
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MP3204 Summary of contents
Page 1
... The MP3204 includes under-voltage lockout, current limiting and thermal overload protection preventing damage in the event of an output overload. The MP3204 is available in a small 6-pin TSOT23 package. EVALUATION BOARD REFERENCE Board Number EV3204DJ-00A ...
Page 2
... SW 1 GND TSOT23 Part Number* Package MP3204DJ TSOT23-6 * For Tape & Reel, add suffix –Z (eg. MP3204DJ–Z) For Lead Free, add suffix –LF (eg. MP3204DJ–LF–Z) ELECTRICAL CHARACTERISTICS 5V +25°C, unless otherwise noted Parameters Operating Input Voltage Supply Current (Shutdown) ...
Page 3
... SW. SW can swing between GND and 25V. 2 GND Ground. Feedback Input. The MP3204 regulates the voltage across the current sense resistor 3 FB between FB and GND. Connect a current sense resistor from the bottom of the LED string to GND. Connect the bottom of the LED string to FB. The regulation voltage is 104mV. ...
Page 4
... The MP3204 uses constant frequency, peak current mode boost regulator architecture to regulate a series of white LEDs. The operation of the MP3204 can be understood by referring to the block diagram of Figure 1. At the start of each oscillator cycle the FET is turned on through the control circuitry. To prevent sub- ...
Page 5
... MP3204 2 3 GND FB Figure 2—Driving 3 White LEDs capacitor is www.MonolithicPower.com © 2005 MPS. All Rights Reserved. MP3204 – 6V, 1.3MHz WHITE LED DRIVER LED1 LED2 LED3 MP3204_F02 V SW 5V/div. V RIPPLE OUT (AC COUPLED) 50mV/div 100mA/div. Figure 3—Steady-State Operation (V =3.6V, 3 LEDs, 20mA) ...
Page 6
... TM Figure 4 shows the startup behavior of the MP3204. The ramped voltage that is added to the current sense amplifier reduces the current output as the duty cycle increases. As more LEDs are added, the output voltage rises but the current that can be delivered to the load is reduced as well ...
Page 7
... Other applications require the use of a logic signal to execute the dimming. This can be seen in Figure 7. The PWM signal is applied to the EN pin of the MP3204. The LEDs will switch between full load to complete shutoff. The average current through the LEDs will increase proportionally to the duty cycle of the PWM signal ...
Page 8
... Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP3204 Rev. 1.3 9/23/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. MP3204 – 6V, 1.3MHz WHITE LED DRIVER TSOT23-6 3 SEATING PLANE 0.00-0.10 www.MonolithicPower.com © ...