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TDA8939TH Datasheet(PDF) 6 Page - NXP Semiconductors |
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TDA8939TH Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 21 page 9397 750 13023 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. Objective data sheet Rev. 01 — 22 April 2004 6 of 21 Philips Semiconductors TDA8939 Zero dead time Class-D 7.5 A power comparator The block diagram of diagnostic output including OTP, OCP and OVP is illustrated in Figure 3. The diagnostic output (pin 7) is an open-drain output; a pull-up resistor connected to +Vpull-up has to be applied externally. 8.3 Interfacing between controller and the TDA8939 For interfacing with a digital PWM controller IC or microcontroller in the final system application the following inputs and outputs are available see Table 4 and 5. 8.3.1 Inputs Fig 3. OCP, OTP and OVP protection: S/R latch. 001aaa623 +Vpull-up OTP LATCH OCP OVP S RQ enable disable power stage +Vint TDA8939 open-drain DIAGN CGND R2 Rpu C1 R1 Table 4: Inputs Pin name Pin number Description IN1P and IN1N 4 and 2 full differential input for output channel 1; referenced with respect to each other; common mode referenced to VSSD IN2P and IN2N 9 and 11 full differential input for output channel 2; referenced with respect to each other; common mode referenced to VSSD POWERUP 5 standby switch; reference to CGND; at a LOW level the device is in standby mode and consumes a very low standby current. At HIGH level the device is DC-biased (switch-on of internal reference voltages and currents). The device can only be switched to full operating mode by the enable input, if the power-up input is at HIGH level. ENABLE 6 mode switch; reference to CGND; at a LOW level the power D-MOS switches are open and the PWM output is floating; all internal logic circuits are in reset condition. At a HIGH level the power comparator is fully operational if the power-up input is also at a HIGH level. In this condition the power comparator outputs are controlled by the input pins (IN1P, IN1N, IN2P and IN2N); see also Figure 6. The enable input signal is also used to reset the protection latch. |
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