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L4952D Datasheet(PDF) 5 Page - STMicroelectronics |
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L4952D Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 8 page is High the device is switched on. The diagnostic circuitry detect the low drop voltage. In this case the DIAG output is going low and can mute the power output stage to avoid noise on the loudspeaker.The two internal switches can switch the stabilized output voltage with P-MOS Transistors to one of the outputs 2 and 3 with low drop. This is useful to switch the AM and FM cir- cuitry on or off. To control it there are two digital inputs En2 and En3 one for each switch. EN2 is High active and EN3 is Low active. It’s possible to drive the AM/FM switch with one digital line (EN2 and EN3 together). The driver for the external High side switch can switch on and off the external pnp transistor. The drop detection circuitry avoid the damage of the external power pnp transistor. To supply the varicaps and the PLL-opamp of the car radio a second very low drop 10 V regulator is available. This regulator in dropout has a typical resistance of 50 Ω. Function of the external High side switch driver Fig 2 shows the principle circuitry of the external High side switch. Fig. 3 shows the switch on/off phase of the external High side switch. At the time t0 the microcontroller switches on (curve 1 = output signal of the microcontroller). The signal on the HSON pin of the L4952 is shown on curve 2. At t1 the external Power pnp is switched on. At t2 (VHSON = VSON2) the internal comparator compares the drop of the external pnp. In case of normal operation the drop is smaller than VDth and no failure will be detected (curve 3). In case of failure (that mean a higher drop than VDth ) the external power pnp will be switched off (curve 4). If an error is detected it will be stored in the internal error flip-flop. The external pnp can only be switched on again after having turned HSON off (VHSON < VSON1) again. Figure 4: Logic input currents versus input voltage Figure 3: Stand by consumption versus temperature Supply voltage rejection (C = 10 µF, ESR = 4.7Ω, Load at OUT4 = 10k Ω) Figure 5: Supply rejection versus Frequency. OUT2 propagation delay (Load = 100 Ω) Figure 6: OUT2 propagation delay (Load = 100 Ω) Typical Characteristics (Note 4) L4952 5/8 Obsolete Product(s) - Obsolete Product(s) |
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