L4915 Datasheet PDF | STMicroelectronics

STMicroelectronics L4915

the L4915 consents to avoid the saturation of the series element by regulating the value of the reference voltage (pin 2). The ripple rejection is externally adjustable acting on CFT as follows : Vi (jΩ) 10−6 SVR (jΩ) = =1+ R1 gm VOUT (jΩ) 1 + jw C R2 FT Where: gm = 2 ⋅ 10-5 Ω-1 = OTA’S typical transconductance value on linear region R1 = fixed ratio R2 CFT = value of capacitor in µF The reaction time of the supervisor loop is given by the transconductanceof the OTAand by CFT.

Part No.	L4915
Datasheet	L4915 Download
Manufacturer	STMicroelectronics
Description	ADJUSTABLE VOLTAGE REGULATOR PLUS FILTER
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DESCRIPTION

This circuit combines both a filter and a voltage regulator in order to provide a high ripple rejection over a wide input voltage range. A supervisor low-pass loop of the element prevents the output transistor from saturation at low input voltage. The non linear behaviour of this control circuitry allows a fast settling of the filter. PIN CONNECTION POWER MINIDIP ORDERING NUMBER : L4915 June1993 1/7 L4915 BLOCK DIAGRAM

ABSOLUTE MAXIMUM RATINGS

Symbol Vi Vi IO Ptot Tstg Parameter Peak Input Voltage (300 ms) DC Input Voltage Output Current Power Dissipation Storage and Junction Temperature Value 40 28 Internally Limited Internally Limited – 40 to 150 Unit V V °C THERMAL DATA Symbol Rth j-amb R th j-pins Parameter Thermal Resistance Junction-ambient Thermal Resistance Junction-pins Max. Max. Value 80 20 Unit °C/W °C/W

ELECTRICAL CHARACTERISTICS

(Tamb = 25oC; Vi = 13.5 V, VO = 8.5V, circuit of Fig. 1, unless otherwise specified) Symbol Vi Vo ∆VI/O ∆ VO ∆ Vo ∆ Vo Vref Iq ∆Iq IAD...