PDF LV5980MC Data sheet ( Hoja de datos )

Número de pieza	LV5980MC
Descripción	Step-down Switching Regulator
Fabricantes	Sanyo
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No Preview Available ! Ordering number : ENA2104 LV5980MC Bi-CMOS IC Low power consumption and high efficiency Step-down Switching Regulator Overview LV5980MC is 1ch DCDC converter with built-in power Pch MOSFET. The recommended operating range is 4.5V to 23V. The maximum current is 3A. The operating current is about 63µA, and low power consumption is achieved. Features and Functions • 1ch SBD rectification DCDC converter IC with built-in power Pch MOSFET • Typical value of light load mode current is 63µA • 4.5V to 23V Operating input voltage range • 100mΩ High-side switch • Output voltage adjustable to 1.235V • The oscillatory frequency is 370kHz • built-in OCP circuit with P-by-P method • When P-by-P is generated continuously, it shifts to the HICCUP operation • External capacitor Soft-start • Under voltage lock-out, thermal shutdown Applications • Set top boxes • Point of load DC/DC converters • White Goods • DVD/Blu-ray drivers and HDD • Office Equipment • LCD monitors and TVs • POS System Application Circuit Example VIN C1 10µF ×2 C3 1µF R1 47kΩ C7 C6 C5 1µF 4.7nF 2.2nF PDR VIN L1 10µH VOUT SW D1 5V R3 C2 REF LV5980MC FB COMP 10µF ×3 R2 SS/HICCUP GND C1: GRM31CB31E106K [murata] C2: C2102JB0J106M [TDK] L1: FDVE1040-100M [TOKO] D1: SB3003CH [SANYO] 100 VOUT = 5V 90 80 70 Efficiency VIN=8V VIN=15V VIN=12V 60 50 40 30 20 10 0 0.1 2 3 5 7 1 2 3 5 710 2 3 5 7100 2 3 5 71000 2 3 5 710000 Load current -- mA Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment. The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for new introduction or other application different from current conditions on the usage of automotive device, communication device, office equipment, industrial equipment etc. , please consult with us about usage condition (temperature, operation time etc.) prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. N2112NKPC 20120801-S00003 No.A2104-1/16 1 page Block Diagram Wake-up Band-gap Bias 1.235V LV5980MC VIN uvlo.comp TSD REF enable Pch Drive SS/HICCUP HICCUP_SD enable HICCUP_SD ILIM Logic SS_END.comp ocp.comp HICCUP_SD pwm comp 15pulse counter PbyP.comp REF PDR FB COMP error.amp slope OSC lnit.comp clk SQ CKRQ Level-shift PDR gnd GND SW No.A2104-5/16 5 Page LV5980MC Calculation of external phase compensation constant Generally, to stabilize switching regulator, the frequency where closed loop gain is 1 (zero-cross frequency fZC) should be 1/10 of the switching frequency (or 1/5). Since the switching frequency of this IC is 370kHz, the zero-cross frequency should be 37kHz. Based on the above condition, we obtain the following formula (12). VREF VOUT • GMER • RC + 1 SCC • GCS • 1 + RL SCO • RL = 1 (12) As for zero-cross frequency, since the impedance element of phase compensation is RC >>1/SCC, the following equation (13) is obtained. VREF RL VOUT • GMER • RC • GCS • 1 + 2π • fZC • CO • RL = 1 (13) Phase compensation external resistance can be obtained with the following formula (14), the variation of the formula (13). Since 2π • fZC • CO • RL >> 1 in the equation (14), we know that the external resistance is independent of load resistance. RC = VOUT VREF • 1 GMER • 1 GCS • 1 + 2π • fZC • RL CO • RL (14) When output is 5V and load resistance is 5Ω (1A load), the resistances of phase compensation are as follows. GCS = 2.7A/V, GMER = 220µA/V, fZC = 37kHz RC = 5 1.235 × 220 1 × 10-6 × 1 2.7 × 1 + 2 × 3.14 × (37 × 103) 5 × (30 × 10-6) × 5 = 48.898…× 103 = 48.90 [kΩ] If frequency of zero point fz and pole fp1 are in the same position, they cancel out each other. Therefore, only the pole frequency remains for frequency characteristics of the closed loop gain. In other words, gain decreases at -20dB/dec and phase only rotates by 90º and this allows characteristics where oscillation never occurs. fp1 = fz 11 2π • CO • RL •2π • CO • RC CC = RL • CO RC • 5 × (30 × 10-6) 48.9 × 103 = 3.067…× 10-9 = 3.07 [nF] The above shows external compensation constant obtained through ideal equations. In reality, we need to define phase constant through testing to verify constant IC operation at all temperature range, load range and input voltage range. In the evaluation board for delivery, phase compensation constants are defined based on the above constants. The zero-cross frequency required in the actual system board, in other word, transient response is adjusted by external compensation resistance. Also, if the influence of noise is significant, use of external phase compensation capacitor with higher value is recommended. No.A2104-11/16 11 Page

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