AN022 MP3388 White LED Driver for LCD Backlighting

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1 The Future of Analog IC Technology AN022 MP3388 White LED Driver for LCD Backlighting INDEX INTRODUCTION....2 REFERENCE DESIGN CURRENT BALANCE... 5 PWM DIMMING FAULT PROTECTION START UP SEQUENCES...10 FLEXIBLE APPLICATION...10 LAYOUT CONSIDERATIONS CONCLUSION...12 AN022 Rev

2 The Future of Analog IC Technology AN022 MP3388 White LED Driver for LCD Backlighting MP3388 INTRODUCTION The MP3388 is a step-up converter with 8-channel current sources designed for driving typically 80 white LEDs (10 LEDs in series per string and 8 strings in parallel) for large size LCD panel backlighting applications. The MP3388 uses current mode, fixed frequency architecture. The switching frequency can be selected at 1.25MHz or 625 khz. It generates an output voltage up to 50V from a 4.5V to 25V input supply. The MP3388 regulates the current in each LED string to the user programmed value set by an external current setting resistor. The MP3388 applies an internal current source in each LED string terminal to balance the connects. The current matching achieves 3% regulation accuracy between strings. Its low 600mV regulation voltage on LED current sources reduces power loss and improves efficiency. The MP3388 has multiple rich PWM dimming modes, including external PWM signal dimming, DC input keep PWM dimming or PWM input burst dimming with capacitor set frequency. The MP3388 has multiple features to protect the converter from fault conditions, including input UVLO, current limiting, output over-voltage, output short to GND, short LED, open LED and thermal shut-down protection. If the fault conditions occur in several strings, the MP3388 marks them off while the remaining LED strings are still in normal operation. REFERENCE DESIGN A typical application circuit with MP3388 for large size LCD panel backlight application is shown in Figure 1. The LED array consists of 80 LEDs with 10 LEDs in series and 8 strings in parallel. It is suitable for notebook, LCD TV, handy terminals displays and automotive display system backlighting where the input power comes from either the batteries or the adapter. Figure 1 Typical Application for Driving WLED Array AN022 Rev

3 The detailed design specifications and BOM list are shown in Table 1 and Table 2. Table 1. Specifications for Typical Application Input Voltage LED Forward Voltage LED Current Open LED Protection Short Circuit Protection 4.5V~21V 10x3.2V 8x20mA Yes Yes Table 2. BOM List for Typical Application Qty Ref Value Description Package Manufacturer Manufacturer P/N 1 C1 4.7µF Ceramic Capacitor, 50V, X7R 1210 Murata GRM32ER71H475KA8 1 C2 2.2uF Ceramic Capacitor, 50V, X7R 1210 Murata GRM32ER72A225KA3 1 C3 4.7uF Ceramic Capacitor, 16V, X5R 0805 Murata GRM21BR61C475KA8 1 C4 68nF Ceramic Capacitor, 50V, X7R 0603 Murata GRM188R71H683KA0 1 C5 1.8nF Ceramic Capacitor, 50V, X7R 0603 Murata GRM188R71H182KA0 1 C6 68nF Ceramic Capacitor, 50V, X7R 0603 Murata GRM188R71H683KA9 1 D1 Diode Schottky, 60V, 1A SMA Diodes Inc DFLS160-F 1 L1 10µH Inductor,2.47A SMD Cooper DR M1 P- channel MOSFET SO8 AM4499P 1 R1 324kΩ Resistor, 1% 0603 Yageo RC0603FR-07324KL 1 R2 10kΩ Resistor, 1% 0603 Yageo RC0603FR-0710KL 1 R3 60.4kΩ Resistor, 1% 0603 Yageo RC0603FR-0760K4L 1 U1 LED Driver IC QFN24 MPS MP3388DR Setting the LED Current The current flowing into each LED strings is set through the current setting resistor on the ISET pin. Where I LED =20mA, R SET =60.4kΩ Selecting the Switching Frequency 1.21V I LED = 1000 R MP3388 has two available switching frequencies, 1.25MHz and 625 khz. The Switching Frequency Selection (OSC) input sets the internal oscillator frequency as shown in Table 3.Connect OSC pin to GND corresponds to the frequency 625 khz. OSC pin to VCC or floating it corresponds to 1.25MHz. In this application, the OSC pin is floated for 1.25MHz switching frequency. The high-frequency operation optimizes the solution for the smallest component size. SET AN022 Rev

4 Table 3. Frequency Selection OSC PIN CONNECTION SWITCHING FREQUENCY(kHz) Vcc /Floating 1250 GND 625 Selecting the Inductor A larger value inductor results in less ripple current, resulting in lower peak inductor current and reducing stress on the internal N-Channel MOSFET. However, the larger value inductor has a larger physical size, higher series resistance, and lower saturation current. Choose an inductor that does not saturate under the worst-case load conditions. A good rule for determining the inductance is to allow the peak-to-peak ripple current to be approximately 30% to 40% of the maximum input current. Calculate the required inductance value by the equation: VIN (VOUT VIN ) L = VOUT fsw ΔI VOUT I I IN(MAX) = V η IN Δ I = (30% ~ 40%) LOAD(MAX) I IN(MAX) Where V IN is the minimum input voltage, f SW is the switching frequency, I LOAD(MAX) is the maximum load current, I is the peak-to-peak inductor ripple current and ηis the efficiency. When V IN =4.5V, f SW =1.25MHz, I LOAD(MAX) =8x20mA=160mA, V OUT =10x3.5V+0.5=35.5V, the inductor is calculated L=7.3uH. So a 10uH inductor with a DC current rating of at least 40% higher than the maximum input peak current is employed. For highest efficiency, the inductor s DC resistance should be as small as possible. Selecting the Schottky Diode The output rectifier diode supplies current to the output capacitor when the internal MOSFET is off. A Schottky diode is recommended due to lower diode forward voltage and short recovery time. The diode should be rated for a reverse voltage greater than the output voltage used. The average current rating must be greater than the maximum load current expected, and the peak current rating must be greater than the peak inductor current. Selecting the Input and Output Capacitor The input capacitor reduces the surge current drawn from the input supply and the switching noise from the device. Ceramic capacitors with X5R or X7R dielectrics are highly recommended because of their low ESR and small temperature coefficients. For most applications, a 4.7μF~10μF capacitor is sufficient. The output capacitor keeps the output voltage ripple small and ensures feedback loop stability. Ceramic capacitors with X7R dielectrics are recommended for their low ESR characteristics. For most applications, a 1μF~4.7μF ceramic capacitor is sufficient. Base on these components with above parameters, the efficiency is up to about 90% at 21V input voltage. Figure 2 shows the bench-test efficiency curve and steady state waveform for this application design. AN022 Rev

5 Efficiency vs Vin Efficiency(%) Vin(V) (a) Efficiency Curve (b) Steady State Waveform (Vin=15V) Figure 2. The Bench-Test Efficiency Curve and Steady State Waveform CURRENT BALANCE The MP3388 uses 8-channel current control to regulate their corresponding LED string currents. The internal current source implements 3% current matching balance between strings. The proportion of the current through the current setting resistor and the LED string is 1:1000. The current matching is defined as (I LED_MAX I LED_MIN )/ (2 I LED_AVERAGE ) PWM DIMMING The MP3388 provides 4 different dimming methods 1, PWM dimming mode with internal triangle waveform generator Apply a 100Hz to 50kHz square waveform to the PWMI pin. The internal 400kΩ and external capacitor on PWMO pin filters the dimming signal to a DC voltage(0.2v~1.2v).then the DC voltage is modulated to an internal PWM dimming signal whose frequency is set via the capacitor on FSET pin according to the equation: f DPWM = 3.5uF / C FSET DPWM Oscillator has an internal 7.5uA (±15% tolerance) constant current source to charge C FSET. When the voltage amplitude exceeds 1.2V, another 7.5uA internal constant current source discharges C FSET to 0.2V. These repetitive behaviors generate a triangle waveform with 1.2V amplitude. The minimum recommended amplitude of the PWM signal is 1.5V (See Figure 3) Figure 3. PWM Dimming with Internal Triangle Waveform Generator AN022 Rev

6 Figure 4 shows the PWM Dimming waveforms and curves. The I LED increases linearly with PWM duty. ILED(mA) ILED Vs. PWM DUTY 500HZ 5kHZ 10kHZ 100kHZ PWM DUTY(%) (a) PWM Dimming Waveform (b) PWM Dimming Curve Figure 4. PWM Dimming Waveform and Curve 2, Direct PWM dimming with positive logic An external PWM dimming signal is directly employed to achieve PWM dimming control without a low pass filter. In order to set the voltage on FSET pin between 0.2V and 1.2V with internal 7.5uA (±15% tolerance) current source, connect a 100kΩ resistor from FSET pin to GND. Apply a 100Hz to 2 khz external square waveform to the PWMI pin for positive logic dimming. The minimum recommended amplitude of the PWM signal is 1.5V (See Figure 5). Figure 5. Direct PWM Dimming with Positive Logic Figure 6 shows the PWM Dimming waveforms and curves. The I LED increases linearly with PWM duty. AN022 Rev

7 ILED Vs. PWM DUTY ILED(mA) Hz 200Hz 2kHz PWM DUTY (a) PWM Dimming Waveform (b) PWM Dimming Curve Figure 6. PWM Dimming Waveform and Curve 3, Direct PWM dimming with negative logic Similar to method 2, apply a 100Hz to 2 khz external square waveform to the PWMO pin for negative logic PWM dimming. The minimum recommended amplitude of the PWM signal is 1.5V (See Figure 7), Figure 7. Direct PWM Dimming with Negative Logic 4, DC input PWM dimming To apply DC input PWM dimming, apply an analog signal (range from 0.2V to 1.2V) at the PWMO pin to modulate the LED current directly. If the PWMO is applied with a DC voltage<0.2v, the PWM duty cycle will be at its maximum. If the PWMO pin is applied with a DC voltage>1.2v, the output will be at its minimum duty cycle (See Figure 8). The capacitor on FSET pin set the frequency of internal triangle waveform. Figure 8. DC Input PWM Dimming AN022 Rev

8 FAULT PROTECTION The MP3388 has multiple features to protect the converter from fault conditions, including input Under Voltage Lock Out (UVLO), programmable Over Voltage Protection (OVP), Over Current Protection, short LED, open LED and Over Temperature Protection. Figure 9 describes the condition and operation flow chart of MP3388. Figure 9. Flow Chart of Operation Setting the Over Voltage Protection The open string protection is achieved through the over voltage protection. In some cases, an LED string failure results in the feedback voltage always equal to zero. The part will run at maximum duty cycle boosting the output voltage higher and higher. If the output voltage exceeds the programmed OVP threshold, the protection will be triggered. To make sure the chip functions properly, the OVP setting resistor divider must be set to a proper value. The recommended OVP point is about 1.1 times higher than the output voltage for normal operation. V OVP =1.23V*(R 1 +R 2 )/R 2 AN022 Rev

9 Open Strings Protection If one or more strings are open, the corresponding LEDX pins are pulled to ground and the IC keeps charging the output voltage until it reach OVP threshold. Then the part will mark off the open strings whose LEDX pin voltage is less than 210mV. Once the mark-off operation completes, the remaining LED strings will force the output voltage back into tight regulation (Figure 10-a). The string with the highest voltage drop is the ruling string during output regulation. The MP3388 always tries to light at least one if all strings in use are open, the MP3388 shuts down the step-up converter (Figure 10-b). The part will maintain mark-off information until the part shuts down. Figure 10 shows the open load protection waveforms when all loads are open and one string of LED is open at working. (a) Open One String of LED at Working (b) Open All Load at Working Figure 10. Open Load Protection Short Strings Protection The MP3388 monitors the LEDX pin voltage to judge if shorted string occurs. If one or more strings are shorted, the corresponding LEDX pins will be pulled up to high voltage. If the LEDX pin voltage is higher than 5.5V, the short string condition is detected. The string is marked off and disabled after 1.6ms delay time. Once a string is marked off, its current regulation is forced to disconnect from the output voltage loop regulation. The remaining LED strings will operate normally without effect (Figure 11-a). When the Schottky is not connected or the output is short to GND, MP3388 detects the OVP pin below 84mV. Then the converter is latched off and turns off the external P-channel MOSFET to disconnect the system from input voltage source(figure 11-b). Figure 11 shows the waveforms when shorting one string of LEDs and while shorting output to GND during operation. AN022 Rev

10 (a) Short One String of LED during operation (b) Short Vout to GND during operation Figure 11. Short Load Protection START UP SEQUENCES Figure 12 shows the start up sequence for normal operation and open/short LED conditions. Short one string Mark off short string 12V Vin Ven 5V PWMI Vfault 12V 400us 6V Vcomp 0.8V <2V Vledx 0.6V 5.5V >5.5V 1.6ms Floating Iled 160mA 140mA Vovp 1V (a) Start Up and One String Open LED Protection (b) Start Up and One String Short LED Protection Figure 12. Short Load Protection FLEXIBLE APPLICATION MP3388 can be employed in situations where the LED strings are less than 8. For these applications, connect the unused string pins to Vout (See Figure 13). The unused strings are marked off when high voltage is detected for about 1.6ms. AN022 Rev

11 Figure 13. Typical Application for Driving 6 Strings of WLED LAYOUT CONSIDERATIONS Careful attention must be paid to the PCB board layout and components placement. Proper layout of the high frequency switching path is critical to prevent noise and electromagnetic interference problems. The loops of the MP3388 SW to PGND pin (U1), output diode (D1), and output capacitor (C2) all have high frequency pulsed current. It must be as short as possible (See Figure 14). The resistor programmed LED current should be close to Iset pin and the loop of Iset to GND (Signal Ground) should be minimized. Figure 14. Layout Consideration The IC exposed pad is internally connected to GND pin, and all logic signals are refer to the GND. The PGND should be externally connected to GND and should be kept to keep away from the logic signals. AN022 Rev

12 CONCLUSION MP3388 totally integrates the power MOSFET, control circuit, current balance circuit, PWM dimming circuit and complete circuit. The external component count is minimized, which reduces the cost and reduces PCB layout size with the small QFN package. MP3388 has the following advantages: High Efficiency and Small Size 4.5V to 28V Wide Input Voltage Range Selectable Switching Frequency: 1.2MHz or 600kHz 3% Current Matching Accuracy Between Strings Flexible PWM Dimming Open LED Protection Short LED protection MP3388 offers a high performance solution for WLED backlighting. It is suitable to notebook PC,.small LCD TV, handy terminate display and automotive system WLED backlighting. AN022 Rev

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