L272 July 2003 DUAL POWER OPERATIONAL AMPLIFIERS ® ..OUTPUT CURRENT TO 1 A .OPERATES AT LOW VOLTAGES .SINGLE OR SPLIT SUPPLY LARGE COMMON-MODE AND DIFFEREN. TIAL MODE RANGE .GROUND COMPATIBLE INPUTS .LOW SATURATION VOLTAGE THERMAL SHUTDOWN DESCRIPTION The L272 is a monolithic integrated circuits in Powerdip, Minidip and SO packages intended for use as power operational amplifiers in a wide range of applications including servo amplifiers and power supplies, compacts disc, VCR, etc. The high gain and high output power capability provide superior performance whatever an operational amplifier/power booster combination is required. Powerdip (8 + 8) Minidip ORDERING NUMBERS : L272 (Powerdip) L272M (Minidip) L272D (SO16 Narrow) PIN CONNECTIONS (top view) SO16 (Narrow) L272M L272D 1/10

BLOCK DIAGRAMS SCHEMATIC DIAGRAM (one only) L272 L272D L272M L272 2/10

ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit Vs Supply Voltage 28 V Vi Input Voltage Vs Vi Differential Input Voltage ± Vs Io DC Output Current 1 A Ip Peak Output Current (non repetitive) 1.5 A Ptot Power Dissipation at: Tamb = 80°C (L272), Tamb = 50°C (L272M), Tcase = 90 °C (L272D) Tcase = 75 °C (L272) 1.2 5 WW Top Operating Temperature Range (L272D) – 40 to 85 °C Tstg, Tj Storage and Junction Temperature – 40 to 150 °C ELECTRICAL CHARACTERISTICS (VS = 24V, Tamb = 25oC unless otherwise specified) Symbol Parameter Test Conditions Min. Typ. Max. Unit Vs Supply Voltage 4 28 V Is Quiescent...

Figure 1 : Quiescent Current versus Supply Voltage Figure 2 : Quiescent Drain Current versus Temperature Figure 3 : Open Loop Voltage Gain Figure 4 : Output Voltage Swing versus Load Current Figure 5 : Output Voltage Swing versus Load Current Figure 6 : Supply Voltage Rejection versus Frequency L272 4/10

Figure 7 : Channel Separation versus Frequency Figure 8 : Common Mode Rejection versus Frequency APPLICATION SUGGESTION NOTE In order to avoid possible instability occuring into final stage the usual suggestions for the linear power stages are useful, as for instance : - layout accuracy ; - a 100nF capacitor corrected between supply pins and ground ; - boucherot cell (0.1 to 0.2 mF + 1 W series) between Figure 9 : Bidirectional DC Motor Control with mP Compatible Inputs Figure 10 : Servocontrol for Compact-disc Figure 11 : Capstan Motor Control in Video Recorders L272 5/10

Figure 12 : Motor Current Control Circuit. Note : The input voltage level is compatible with L291 (5-BIT D/A converter). Figure 13 : Bidirectional Speed Control of DC Motors. 2R3 ° R1 For circuit stability ensure that RX > where RM = internal resistance of motor. RM Vs 2R ° R1 The voltage available at the terminals of the motor is VM = 2 (Vi × ) + ½Ro½ × IM where ½Ro½ = 2 RX and IM is the motor current. L272 6/10

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