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| YKW-06 Preliminary release Rev. 0.30] 20060118^ YKW-06 Step-down Switching Controller GENERAL DESCRIPTION The YKW-06 is a step-down DC-DC converter. It could drivers an external power transistor using the PWM control. The IC incorporates the soft-start function with a proper capacitor connected between SS and ground pins. The soft-start function could ensure the PWM output pulse width starts from 0% duty cycle. The output voltage is controlled by the external sense resistor and FB pin. The output voltage are also adjustable by the external variable resistor connected through SS and BRT pins. Through changing this external resistor value, could tune the output current and voltage. It also has the over voltage detection function with debounce-timer check to prevent from the over voltage damage. FEATURES * * * * * * Operation voltage range : 2.4V ~ 6.0V Adjustable output voltage Built-in oscillator Soft start function Over voltage protection with the debounce-timer check. 8-pin DIP/MSOP/SOP packages APPLICATIONS * White LED lighting controllers * Step-down DC-DC converters * Portable equipment PIN CONFIGURATION OUT SS OVP GND 1 2 3 4 8 7 6 5 VDD COMP BRT FB PIN DESCRIPTION Pin No. 1 2 3 4 5 6 7 8 *s|Ei 3/4Cu Pin Name OUT SS OVP GND FB BRT COMP VDD *~eIu I/O O B I P I I O P Description PWM output (High : PWM on period) Soft-start timing Setting with external capacitor Over voltage protection and Disable function Ground Output voltage feedback sense, error amplifier(-) input Output current setting , error amplifier(+) input Output voltage, error amplifier(o) output Power supply 24 2 1/4O TEL:03-5780241 FAX:03-5794278.5770419 Page 1 of 5 *~F Eo YKW-06 Preliminary release Rev. 0.30] 20060118^ BLOCK DIAGRAM VDD OVP Vovp Vref Iss SS Soft-start control OUT COMP FB BRT GND ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings Parameter DC Supply Voltage (VDD) Input and output voltage Min. -0.3 -0.3 Max. 6.0 VDD+0.3 Units V V *Note: Stresses above those listed may cause permanent damage to the devices *s|Ei 3/4Cu *~eIu *~F Eo 24 2 1/4O TEL:03-5780241 FAX:03-5794278.5770419 Page 2 of 5 YKW-06 Preliminary release Rev. 0.30] RECOMMENDED OPERATING CONDITIONS Parameter Supply Voltage (VDD) Min. 2.4 Typ. 5 Max. 6 Unit V o o 20060118^ Storage temperature Ambient temperature with power applied -25 0 ----- 125 70 C C ELECTRICAL CHARACTERISTICS (AT Ta=25J , VDD=5V) Min. ------1.16 ----------0.9 70 --------82 Typ. 750 150 168 1.2 70 350 6 81 110 1.0 88 5 5 600 500 87 Max. ------1.24 ----------1.1 105 --------92 Unit uA uA KHz V dB KHz V/us uA us V us mA mA ns ns H Parameter Condition VDD SUPPLY CURRENT IDD normal supply current EN=VDD, output no-load IDD enable supply current EN=0V BUILT-IN OSCILLATOR Internal Frequency f REFERENCE VOLTAGE Internal reference voltage (Vref) ERROR AMPLIFIER DC gain Gain bandwidth Slew rate SOFT-START FUNCTION Source current (Iss) Soft-start timing (Tss) C2=0.01uF OVER VOLTAGE PROTECTION AND DISABLE FUNTION Threshold voltage (Vovp) VovpO 1.0V,over voltage protection Debounce time (Tovp) 15x( 1 / f ) OUTPUT DRIVER Output source current Voutb=4.6V Output sink current Voutb=0.4V Rise time Cload=1000pF Fall time Cload=1000pF OUTPUT DUTY RATIO Maximum duty ratio *s|Ei 3/4Cu *~eIu *~F Eo 24 2 1/4O TEL:03-5780241 FAX:03-5794278.5770419 Page 3 of 5 YKW-06 Preliminary release Rev. 0.30] TYPICAL REFERENCE APPLICATION INFORMATION VCC Q1 L1 20060118^ D1 C1 R3 D2 R5 R1 R2 VDD 1 2 3 4 OUT SS OVP GND VDD COMP BRT FB 8 7 6 5 C4 R4 C5 VR C3 C2 A. Over voltage protection V1 OVP pin OVP SS pin OUT pin Tovp V ref Tss B. EN pin function VDD V ref SS pin OUT pin ENOVP (Internal) Tss C. SS & BRT & FB pin function SS FB BRT VR Ra=50K R1 Ia VFB=Ia*R1 *s|Ei 3/4Cu *~eIu *~F Eo 24 2 1/4O TEL:03-5780241 FAX:03-5794278.5770419 Page 4 of 5 YKW-06 Preliminary release Rev. 0.30] PACKAGE DIMENSION MSOP-8 20060118^ DIP-8 *s|Ei 3/4Cu *~eIu *~F Eo 24 2 1/4O TEL:03-5780241 FAX:03-5794278.5770419 Page 5 of 5 |
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