TS2581PWM Controller Pin Defi nition: 1. EN/CT 8. FB General Description The TS2581 integrates Pulse-Width-Modulation (PWM) control circuit into a single chip, mainly designs for power-supply regulator. All the functions include an error amplifier, a soft-start, UVLO, OVP, SCP, TSD circuitry. This device features an internal 100KHz oscillator, the UVLO makes sure that the outputs are off until the internal circuit operates normally. Note: “G” denotes for Halogen Free Features • Input voltage : 8V to 40V • Duty ratio : 0% to 100% PWM control • Oscillation frequency: 100K/300KHz • Thermal Shutdown function. • Short Circuit Protect (SCP). • External SW P-channel MOS. • External OVP setting function. • Current mode non-synchronous PWM converter • External current limit setting. • Under voltage Lockout. Ordering Information Application • Simple High-efficiency Step down Regulator • Charger • Telecommunication Absolute Maximum Rating Parameter Thermal Information Parameter Note1: 0JA is measured on the PCB with minimum copper area. 2 Note2: 0JA is measured with the PCB copper area (need connect to GROUND pins) of approximately 0.5 in

TS2581PWM Controller Electrical Specifications (Ta = 25oC unless otherwise noted, V|N=12V) Pin Function Description Name

TS2581PWM Controller Function Description Feedback Sense the regulated output voltage to complete the feedback loop, when VFB <0.4V, the SCP is happened. VSENSE The current limit sense pin, if VIN-VSENSE^ 110mV, the over current is happened that it can turn-off driver cycle by cycle. OVP The Over Voltage sense pin, If VOVP >1.10V, the OVP is happened that it can turn-off the driver. You can set VOUT OVP voltage by outside resistances (R3 and R4), Please see below formula to set. R 2 VOUT (ovp) = 1.10 x(1+—) The Over Voltage Protect, If VOVP >1.10V, the OVP is happened that it can turn-off the...

TS2581PWM Controller Application Information Setting the Output Voltage Application circuit item shows the basic application circuit with adjustable output version. The external resistor sets the output voltage according to the following formula: Vout = 1.0V x (1 + R3 R6 Table 1 Resistor select for output voltage setting Where is inductor Ripple Current. Large value inductors lower ripple current and small value inductors result in high ripple currents. Choose inductor ripple current approximately 20% of the maximum load current 3A, AIL=0.6A. The DC current rating of the inductor should be at...

TS2581 PWM Controller Application Information (Continue) Output Capacitor Selection The output capacitor is required to filter the output and provide regulator loop stability. The important capacitor parameters are; the 100 KHz Equivalent Series Resistance (ESR), the RMS ripples current rating, voltage rating, and capacitance value. For the output capacitor, the ESR value is the most important parameter. The ESR can be calculated from the following formula. An aluminum electrolytic capacitor’s ESR value is related to the capacitance and its voltage rating. In most case, higher voltage electrolytic...

Unit: Millimeters Marking Diagram Y = Year Code M = Month Code for Halogen Free Product (O=Jan, P=Feb, Q=Mar, R=Apl, S=May, T=Jun, U=Jul, V=Aug, W=Sep, X=Oct, Y=Nov, Z=Dec) L = Lot Code

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