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IGBT Driver Control

F_ON

G_IGBT

CHG

XFULL

STANDBY

STANDBY

PREACTIVE

SW On

SW Off

etc

FULL CHARGE

Protections

MAX On Time

MAX Off Time

Thermal Disable

TPS65560

SLVS608 – JANUARY 2006

The IGBT driver is provided by the TPS65560. The driver voltage depends on VCC. TPS65560 has a mask filter

as shown in Figure 8. The mask does not have hysteresis; therefore, there is no wait time from CHG forcing Low

after FULL CHARGE to F_ON turning High.

Figure 8. IGBT Timing Diagram

TPS65560 provides four protection mechanisms: max on time, max off time, thermal disable, and overcurrent

shutdown.

To prevent a condition such as pulling current from a poor power source (i.e., an almost empty battery), and

To prevent a condition such as never increasing the voltage at the SW pin when the internal FET is OFF, the

Once the TPS65560 die temperature reaches 160

°C, all functions stop. Once the die cools below 160°C, the

TPS65560 restarts charging if CHG remains high during the entire overtemperature condition.

The TPS65560 provides an overvoltage monitor function of the SW pin. The TPS65560 is latched off if the

This function protects against short-circuits on the primary side of the transformer. A short-circuit of the primary

side shorts the battery voltage to GND. SW pin can damage the device if not protected.

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