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TEA7063DP датащи(PDF) 11 Page - STMicroelectronics |
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TEA7063DP датащи(HTML) 11 Page - STMicroelectronics |
11 / 15 page 7. INTERNAL DESCRIPTION OF CURRENT MANAGEMENT 7.1 Internal Power Supply Management R9 fixes the line power supply management. R9 fixes the values of: Iear,Iup,Iref and ILS. A current line information is used to modifie the values of Iear,Iup,Iref and ILS between a minimum and a maximum values. On Fig 10: The transmit output stage is represented by a cur- rent source (Itr). The Itr value depends of the DC voltage on VLINE (pin 16) and RZAC value. The other internal stages connected to VLINE (pin 16) are represented by a constant 1.3mA current source. 7.2 DC Characteristics (internal) The DC characteristic is equals to: VLINE (pin 16) = VC (pin 17) + R6 • Iint Iint is the sum of all the current sources con- nected on VC (pin 17): [Ip +Iref + Vpin17 / (r7 + r8)] -Ip is the bias internal operational amplifiers power supply. -Iref =1 / 3 • (Vrefi / R9); with Vrefi = 470mV -Iref = 156/R9 mA The current line information changes Iint value; at low line current (6mA): Iint =4V/ R9 +60 µA at low line current (IL = ILb): Iint =8V / R9 + 60 µA 7.3 Microcontroller Supply (internal) Iup = [(p2 / r2) • Iref + 0.3] mA = [(p2 / r2) • 156 / R9) + 0.3] mA The current line information changes p2/r2 value; at low line current (6mA): p2 / r2 = 70 at a line current (IL = ILb): p2 / r2 = 820 7.4 Earphone Current Supply (internal) Iear = (p1 / r1) • Iref mA = (p1 / r1) • (156 / R9) mA The current line information changes p1/r1 value; at low line current (6mA): (p1 / r1) = 200 at a line current (IL = ILb): p1 / r1 = 2700 The maximum peak dynamic on the earphone is: Vpear =Zear • Iear 7.5 Transmit Output Stage (internal) The output stage bias current depends of the DC voltage on pin 16 and on RZAC impedance. Itr = 0.1425 • VLINE − 0.517 RZ (RZ is the resistor connected betwee pin3 and the ground) 7.6 Loudspeaker Current Source (internal) The current source for external peripherals has two slopes: - First slope; before Iear,Iup,Itr and Iint are stabi- lized at their maximum values: (IL = ILb) ILS = 0.285 • IL - Second slope; after Iear,Iup,Itr and Iint are sta- bilized at their maximum values: (for IL > ILb) ∆ (ILS) = 0.91 •∆(ILINE Iear,Iup,Itr and Iint are stabilized at their maximum values between 16 and 26mA, the absolute IL value depends of R9 value. The line current (ILb) where Iear,Iup, Itr,Iint are stabilized at their maxi- mum values and where the slope of ILS change is: ILb = Iear + Iup + Itr + Iint + 1.3 0.715 7.7 Numerical Example 1) R9 = 100K Ω; R6 = 25KΩ ♦ DC characteristic = 6V for Iint max: = 5V for Iint min: Iint min (IL = 6mA) = 4 /100K + 60 = 100 µA Iint min (IL = ILb) = 8 /100K + 60 = 140 µA Vpin17 = 2.5V ⇒ R6 = 25KΩ ⇒ Vpin16 min (IL = 6mA) = 2.5 + 25 • 100E - 3 = 5V Vpin16 max (IL = ILb) = 2.5 + 25 • 140E - 3 = 6V ♦ Current Sources Iup min (IL = 6mA) = 0.4mA Iup max (IL = ILb) = 1.6mA Iear min (IL = 6mA) = 0.3mA Iear max (IL = ILb) = 4.2mA with RZ =75 Ω Itr min (IL = 6mA) = 2.6mA Itr max (IL = ILb) = 4.5mA ILS min (IL = 6mA) = 1.3mA ♦ ILb ILb = 1.6 + 4.2 + 4.5 + 0.14 + 1.3 0.715 mA ILb = 16.5mA ILS (for IL = ILb) = 0.285 • ILb = 4.7mA ♦ at IL = 100mA: ∆(ILS) = 0.91 • ∆(IL) = 0.91 • (100 - 16.5) = 76mA ILS = 4.7 + 76 = 80.7mA 2) R9 = 56K Ω; R6 = 18KΩ ♦ DC characteristic = 6.1V for Iint max: ♦ ∆Χ χηαραχτε = 4.8V for Iint min: TEA7063 11/15 |
Аналогичный номер детали - TEA7063DP |
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Аналогичное описание - TEA7063DP |
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