mic3230 Micrel Semiconductor, mic3230 Datasheet
mic3230
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mic3230 Summary of contents
Page 1
... The MIC323x family is dimmable via a pulse width modulated (PWM) input signal and also features an enable pin for low power shutdown. Multiple MIC3230 ICs can be synchronized to a common operating frequency. The clocks of these synchronized devices can be used together in order to help reduce noise and errors in a system ...
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... DRV MIC3230/31 FS COMP 0.25V FB VDD IADJ AGND PGND EPAD Power ground Figure 1. Typical Application of the MIC3230 LED Driver MIC3230 MIC3231 6V to 45V 6V to 45V Yes No Adj from 100kHz to 1MHz EPAD TSSOP-16 EPAD TSSOP-16 ® -12 3mm × 3mm MLF Temperature Range – ...
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... AGND Analog Ground -- NC No Connect -- SYNC Sync (output). Connect to another MIC3230 to synchronize multiple converters Current Sense (input). Connected to external current sense resistor which in turn is connected to the source of the external FET as well as an external slope compensation resistor 7 OVP OVP divider connection (output) ...
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... Absolute Maximum Ratings Supply Voltage (V ) .....................................................+48V IN Enable Pin Voltage........................................... -0.3V to +6V IADJ Voltage ..................................................................+6V Lead Temperature (soldering, #sec.)......................... 260°C Storage Temperature (Ts)..........................-65°C to +150°C (3) ESD Rating ..................... MIC3230= 1500V HB, 100VMM .........................................MIC3232= 2kV HB, 100VMM .................................... MIC3231= 1500V HB, 150VMM Electrical Characteristics V = 12V 3.6V 47µ 4.7µ Symbol ...
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... The device is not guaranteed to function outside its operating rating. 3. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kΩ in series with 100pF. 4. Specification for packaged product only. 5. Guaranteed by design January 2009 V = 12V IN Hysteresis 5 MIC3230/1 150 °C 5 °C M9999-011409-A ...
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... Micrel, Inc. Typical Characteristics January 2009 6 MIC3230/1/2 M9999-011409-A ...
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... Micrel, Inc. January 2009 12.2 12.15 12.1 12.05 12 11.95 11.9 11.85 11 MIC3230/1/2 Load Regulation V 3. 100 125 150 LOAD (mA) M9999-011409-A ...
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... The MIC323x family can also be configured as a SEPIC controller, where the output voltage can be either above or below the input voltage. The MIC3230/1/2 have a very wide input voltage range, between 6V and 45V, to help accommodate for a diverse range of input voltage applications. In addition, the LED current can be programmed to a wide range of values through the use of an external resistor ...
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... D T master IC will override the oscillator of the slave part(s) and all MIC3230 will be synchronized to the same master OUT switching frequency. The SYNC pin is designed to be used only by other MIC3230s and is available on the MIC3230 only. If the SYNC pin is being unused left floating (open). ...
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... SOFTSTART 6 μA is usually between 0.7V to 3V, but can ( = × COMP _ STEADY _ STATE × × RAMP Where SLC × 1.4 V Duty cycle (0 to1 period MIC3230/1/2 and is labeled Y_STATE ) + Vcs PK × and T M9999-011409-A ...
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... VIN 250µa +RSLC– × RAMP SLP × – 1/2 I L_PK L_AVE L_PP L_AVE IN_AVE L_PP L_AVE IN_AVE I FET_RMS I OUT MIC3230/1 − nearly equals I IN_RMS M9999-011409-A ...
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... PWM Dimming Output over voltage OVP protection System F Switching frequency SW eff Efficiency Forward drop of schottky V diode DIODE January 2009 ) Min 8 5 3.2 16 0.33 0 Table 2. Design example parameters 12 Nom Max Units 3.5 4 0.35 0. 100 % 30 V 500kHz 80 % 0.6 V M9999-011409-A MIC3230/1/2 ...
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... Micrel, Inc. VIN CIN 4.7µF/50v R2 100k ENABLE PWMD Synch to other MIC3230 RFS 16.5k CCOMP 10nF C3 10µF 10V Analog ground Design Example In this example, we will be designing a boost LED driver operating off a 12V input. This design has been created to drive six LEDs at 350mA with a ripple of about 12%. ...
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... Limit Limit − RAMP = Limit CS − × 250 actual . 150 Limit 1 MIC3230/1 the IC enters . waveform and × + × Limit ) × max + Limit = Ω ...
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... RIPPLE SW To protect the IC from inductive e, the FET has to hold off an output = + P P FET FET _ COND = P I FET _ COND FET _ RMS MIC3230/1/2 = Ω total e This is because has to OUT before the OUT times the inductor μ ...
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... DS(on) G about 0.7W for a SO-8 or about 1W for a PowerPak (FET package). The Vishay Siliconix Si7148DP in a PowerPak SO-8 package is one good choice. The internal gate driver in the MIC3230/1/2 is 2A. From the Si7148DP data sheet: R =0.0145Ω DS(on)_25°C Total gate C harge=68nC (typical) ...
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... It is important to connect the IC’s reference to the same point as the output capacitors to avoid the voltage drop caused by RRC. connection or single point grounding. 4. Feedback trace: The high impedance traces of the FB should be short. 17 MIC3230/1/2 This is also called a star M9999-011409-A ...
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... Micrel, Inc. Package Information January 2009 10-Pin MSOP (MM) 18 MIC3230/1/2 M9999-011409-A ...
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... Micrel, Inc. January 2009 ® 12-Pin 3mm × 3mm MLF (ML) 19 MIC3230/1/2 M9999-011409-A ...
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... Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully January 2009 16-Pin Exposed Pad TSSOP (TSE) indemnify Micrel for any damages resulting from such use or sale. © 2009 Micrel, Incorporated. 20 MIC3230/1/2 nt M9999-011409-A ...