L6599 DATASHEET PDF

High-voltage resonant controller. Not for new design. Figure 1. Block diagram. Table 1.

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High-voltage resonant controller. Not for new design. Figure 1. Block diagram. Table 1. Order code. Order codes. Tape and reel. STBY 5. RFmin 4. Css 1. C BOOT. February Rev 3. This is information on a product still in production but not recommended for new designs.

Pin settings. Table 2. Pin functions continued. Minimum oscillator frequency setting. This pin provides a precise 2 V reference and a. To close the feedback loop that regulates the converter output voltage.

The value of this resistor will set the maximum. Burst-mode operation threshold. The pin senses some voltage related to the feedback. If the voltage on the pin is lower. The chip. Soft-start is not invoked. This function realizes burst-mode operation when the load falls below a level that can be. Tie the pin to RFmin if burst-mode is not used.

Current sense input. The pin senses the primary current though a sense resistor or a. This input is not intended for a cycle-by-cycle control;.

As the voltage. Under output short circuit, this normally results in a nearly constant peak primary current. This condition is allowed for a maximum time set at pin 2. If the current keeps on building up. The information is latched. Tie the pin to GND if. Line sensing input. The pin is to be connected to the high-voltage input bus with a resistor.

A voltage. ON as long as the voltage applied at the pin is below 1. Bypass the pin with a capacitor to GND to reduce noise pick-up. The voltage on. Activating the zener causes the IC to shut down.

Bias the pin between 1. Latched device shutdown. Internally the pin connects a comparator that, when the voltage. The information is latched and it is necessary to recycle the supply voltage of. Tie the pin to GND if the function is not used. This pin, normally open, is intended for. It goes. During UVLO, it is open. Leave the pin unconnected if not.

Chip ground. Current return for both the low-side gate-drive current and the bias current of. All of the ground connections of the bias components should be tied to a track going. Typical electrical performance. Figure 4. Device consumption vs supply. Figure 5. IC consumption vs. Figure 6. V CC clamp voltage vs. Figure 7. UVLO thresholds vs. Pin functions continued N.

Name Function Minimum oscillator frequency setting. This pin provides a precise 2 V reference and a resistor connected from this pin to GND defines a current that is used to set the minimum oscillator frequency.

To close the feedback loop that regulates the converter output voltage 4 RFmin by modulating the oscillator frequency, the phototransistor of an optocoupler will be connected to this pin through a resistor. The value of this resistor will set the maximum operating frequency. An R-C series connected from this pin to GND sets frequency shift at start-up to prevent excessive energy inrush soft-start.

The pin senses some voltage related to the feedback control, which is compared to an internal reference 1. If the voltage on the pin is lower than the reference, the IC enters an idle state and its quiescent current is reduced. This function realizes burst-mode operation when the load falls below a level that can be programmed by properly choosing the resistor connecting the optocoupler to pin RFmin see block diagram.

The pin senses the primary current though a sense resistor or a capacitive divider for lossless sensing. This input is not intended for a cycle-by-cycle control; hence the voltage signal must be filtered to get average current information. As the voltage exceeds a 0. If the current keeps on building up despite this frequency increase, a second comparator referenced at 1. The information is latched and it is necessary to recycle the supply voltage of the IC to enable it to restart: the latch is removed as the voltage on the Vcc pin goes below the UVLO threshold.

The pin is to be connected to the high-voltage input bus with a resistor divider to perform either AC or DC in systems with PFC brownout protection. A voltage below 1. The voltage on the pin is top-limited by an internal zener. Activating the zener causes the IC to shut down not latched. Internally the pin connects a comparator that, when the voltage on the pin exceeds 1. The information is latched and it is necessary to recycle the supply voltage of the IC to enable it to restart: the latch is removed as the voltage on the V CC pin goes below the UVLO threshold.

This pin, normally open, is intended for stopping the PFC controller, for protection purpose or during burst-mode operation. Leave the pin unconnected if not used. All of the ground connections of the bias components should be tied to a track going to this pin and kept separate from any pulsed current return. Device consumption vs supply voltage Figure 5. IC consumption vs junction temperature Figure 6. V CC clamp voltage vs junction temperature Figure 7. Analog Devices.

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L6599 STMicroelectronics, L6599 Datasheet

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