SDB5048A

SDB5048A SHOUDING | Alldatasheet

Document overview

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Technical content

Up to 4.8A Output Current 8.0V to 36V Wide Input Operating Range 38V Input Voltage Surge limitation. The SDB5048A provides programmable The SDB5048A is available in SOP-8 (EP) package. voltage range from 8V to 36V. The SDB5048A can be SDB5048A operates in either CC (Constant Current) The SDB5048A is a dual-channel synchronous Synchronous Step-Down Converter Dual-Channel CC/CV Mode

DESCRIPTION

step-down converter capable of driving 5A continuous load with excellent line and load regulation. The mode or CV (Constant Voltage) mode with an input configured as single output or dual outputs with independent programmable CC threshold for current cable compensation by adjusting external resistor divider. External shutdown function can be controlled by pulling COMP pin to a level below 0.14V. Fault protection includes secondary cycle-by-cycle current limit, short circuit protection and thermal shutdown. Internal soft-start minimizes the inrush supply current and the output overshoot at initial startup. Typical Application Circuit

FEATURES

/circle6 /circle6 /circle680kHz~800kHz Switching Frequency Selection /circle6Dual Channel CC/CV Mode Control /circle6 /circle6+/- 1% Voltage Reference Accuracy /circle6+/- 4% Constant Current Accuracy /circle6Programmable Cable Compensation /circle6Internal Soft Start /circle6Single Pin to External Compensation and Shutdown Control /circle6Hiccup Short Circuit Protection /circle6Secondary Cycle-by-Cycle Current Limit /circle6Thermal Shutdown /circle6Available in SOP-8 (EP) Package /circle6RoHS Compliant and 100% Lead(Pb)-Free Halogen-Free

APPLICATIONS

/circle6Car Charger /circle6Portable charger applications /circle6DC/DC converters with current limited Figure 1. Application Circuit

Figure 2. Functional Block Diagram VIN 1 Input Supply Pin. GND 2 Ground. COMP 3 Loop compensation pin. Drive COMP voltage logic low to turn off the converter. FB 4 Output Feedback Input. CS1 5 Channel 1 current sense input pin. CS2 6 Channel 2 current sense input pin. FREQ 7 Frequency select pin. DRVL 8 Low-side switch drive pin. SW EP Power switch pin. www.shouding.com 5048AVer0.1

-0.3V to 38V SDB5048A SDB5048A SDB5048AES8 5048A

Ordering Information

Order Number Package Type Marking Quantity per Reel Operating Temperature Range SOP-8 (EP) 2500 -40°C to +85°C Absolute Maximum Ratings (1) /square6 Input V oltage (V IN /square6 Switch V oltage (V SW IN +0.3V /square6 /square6 /square6 /square6 /square6 /square6 Thermal Resistance θ JA 60°C /W Recommend Operating Conditions (2) /square6 Supply Voltage (V IN 8V to 36V /square6 Note (1): Stress beyond those listed under “Absolute Maximum Ratings” may damage the device. Note (2): The device is not guaranteed to function outside the recommended operating conditions.

Electrical Characteristics

=12V , T A =+25°C, I OUT =2.0A, unless otherwise specified) Parameter Conditions Min. Typ. Max. Unit Input voltage 8 36 V Input No Load Current I OUT =0A 10 mA Quiescent Current V FB =0.7V 1 mA Shutdown Current V COMP =0V 380 µA Input Under V oltage Lockout Threshold Rising 6.2 6.7 7.2 V Input Under V oltage Lockout Threshold Hysteresis 1 V Current Limit 7.5 A 144 160 176 kHz Operating frequency R6=0 Ω T J = -25°C to 125°C 136 184 kHz Maximum Duty Cycle 100 % Minimum On-Time 400 ns 0.594 0.6 0.606 V Reference V oltage of the V oltage Error Amplifier T J = -25°C to 125°C 0.587 0.613 V 57.4 60 62.6 mV CS1/CS2 Reference Voltage T J = -25°C to 125°C 56.4 63.6 mV Transconductance of Error Amplifier 75 µA/V 0.698 0.72 0.742 V Reference Voltage of the Over Voltage ComparatorT J = -25°C to 125°C 0.691 0.749 V Reference Voltage of the Short Circuit Foldback Comparator 0.24 V COMP Enable Threshold Rising 0.14 V COMP Enable Threshold Hysteresis 40 mV Temperature Rising 150 °C Thermal Shut-down Temperature Temperature Falling 100 °C PMOS Drain-Source On-State Resistance V IN =24V, I OUT =1A 90 m Ω www.shouding.com 5048AVer0.1 ****

Typical Operating Characteristics V IN =12V , V OUT =5V , T A =25°C, unless otherwise noted. www.shouding.com 5048AVer0.1

Typical Operating Characteristics (continued) V IN =12V , V OUT =5V , T A =25°C, unless otherwise noted. www.shouding.com 5048AVer0.1

5048AVer0.1 SDB5048A Typical Operating Characteristics (continued) V IN =12V , V OUT =5V , T A =25°C, unless otherwise noted. www.shouding.com

The SDB5048A provides programmable cable voltage SDB5048A channel 1 constant current value is set by The SDB5048A stops switching when its junction The SDB5048A provides the output short circuit prot The SDB5048A provides programmable cable The SDB5048A operates in either CC mode or CV mode. SDB5048A uses current-mode architecture to control The SDB5048A is a current-mode synchronous step-dow SDB5048A Functional Description n converter with 8V to 36V input power supply. The device can provide up to 5A continuous current to the output. The the regulator loop. The output voltage is measured at FB through a resistive voltage divider and amplified through the internal error amplifier. The output current of the transconductance error amplifier is presented at COMP pin where a RC network compensates the regulator loop. Slope compensation is internally added to eliminate subharmonic oscillation at high duty cycle. The slope compensation adds voltage ramp to the inductor current signal which reduces maximum inductor peak current at high duty cycles. CC/CV mode control The CV mode regulates the output voltage. When output current reaches the CC threshold, the device enters CC mode to limit the output current. Programmable cable compensation compensation by adjusting the external resistor divider to compensate resistive voltage drop across the charger's output cable. Internal soft-start Internal soft-start minimizes the inrush supply current and the output overshoot at initial startup. Over voltage protection OVP (over voltage protection) function with fixed OV (over voltage) threshold set by the internal resistor divider is provided. When output over voltage occurs, the device shuts down and returns to normal operation automatically when the output over voltage is released. Short circuit protection ection function to prevent large output short circuit current from damaging the device. When output short happens, the device shuts down and returns to normal operation automatically when the short circuit condition is released. Thermal Shutdown temperature exceeds 150°C and resumes when the temperature has dropped by 50°C to protect the device.

Application Information

The output voltage is set through a resistive voltage divider and can be expressed by the equation as follows 2R/ ) 2R1R(V6 . 0V OUT +×= Setting the CC current the resistor R3 connected between the CS1 and GND pins. Channel 2 constant current value is set by the resistor R4 connected between the CS2 and GND pins. The CC current is determined by the equation as follows 3R/V06 . 0I 1CS 4R/V06 . 0I 2CS Setting the switching frequency The switching frequency is set by the resistor R6 connected between the FREQ and GND pins and can be expressed by the equation as follows 6R/10f SW The switching frequency is 160kHz when R6=0Ω. Setting the cable compensation drop compensation using the impedance at the FB pin to compensate voltage drop across the charger's output cable. The cable compensation voltage can be expressed as ( ) 1R4RI3RI35 .15V 2OUT1OUTOUT ××+×× µ By adjust the value of R1, the cable compensation voltage can be programmed. www.shouding.com 5048AVer0.1

SOP-8 (EP) Remark: Exposed pad outline drawing is for reference only. MILLIMETERS INCHES SYMBOLS MIN. Normal MAX. MIN. Normal MAX. A 1.35 - 1.75 0.053 - 0.069 A1 0.00 - 0.25 0.000 - 0.010 L 0.40 - 1.27 0.016 - 0.050 b 0.31 - 0.51 0.012 - 0.020 e 1.27 REF 0.050 REF www.shouding.com 5048AVer0.1