TLE7183F

Description and Electrical Characteristics

Data Sheet

12

2.2, 2016-01-27

5.1.2

Operation at Vs<12V - Integrated Charge Pumps

The TLE7183F provides a feature tailored to the requirements in 12V automotive applications. Often the operation

of an application has to be assured even at 9V supply voltage or lower. Normally bridge driver ICs provide in such

power dissipation.

The TLE7183F has two charge pump circuitries for external capacitors.

The operation of the charge pumps is independent upon the pulse pattern of the MOSFETs.

The output of the charge pumps are regulated. The first charge pump doubles the supply voltage as long as it is

below 8V. At 8V supply voltage and above, charge pump 1 regulates its output to 15V typically. Above 15V supply

voltage, the output voltage of charge pump 1 will increase linearly.Yet, the output will not exceed 25V.

Charge pump 2 is regulated as well but it is pumped to the voltage on Vs. Normally VDH and Vs are in the same

voltage range. The driver is not designed to have significant higher voltages at VDH compared to Vs. This would

lead to reduced supply voltages for the high side output stages.

Charge pump 1 supplies the low side MOSFETS and output stages for the low side MOSFETs with sufficient

voltage to assure 10V at the MOSFETs´ gate even if the supply voltage is below 10V. Charge pump 2 supplies

the output stages for the high side MOSFETs with sufficient voltage to assure 10V at the MOSFETs´ gate. In

addition, the charge pump 1 supplies most of the internal circuits of the driver IC, including charge pump 2. Output

of charge pump 1 is the buffer capacitor CB1 which is referenced to GND.

Charge pump 2 supplies the high side MOSFETs and the output stages for the high side MOSFETs with sufficient

voltage to assure 10V at the high side MOSFET gate. Output of charge pump 2 is buffer capacitor CB2 which is

referenced to VDH.

This concept allows to drive all external MOSFETs in the complete duty cycle range of 0 to 100% without taking

care about recharging of any bootstrap capacitors.

This simplifies the use in all applications especially in motor drives with block wise commutation.

The charge pumps are only deactivated when the device is put into sleep mode via INH.

During Start Up of the device it is not allowed to have any PWM patterns at the ILx and IHx pins until the charge

pumps have ramped up to their final values or it is recommended to keep one ENAx pin low. So for proper Wake

The size of the charge pump capacitors (pump capacitors CPx as well as buffer capacitors CBx) can be varied

between 1 µF and 4.7 µF. Yet, larger capacitor values result in higher charge pump voltages and less voltage

ripple on the charge pump buffer capacistors CBx (which supply the internal circuits as well as the external

MOSFETs, pls. see above). Besides the capacitance values the ESR of the buffer capacitors CBx determines the

voltage ripple as well. It is recommended to use buffer capacitors CBx that have small ESR.

Pls. see also Chapter 5.1.3 for capacitor selection.

5.1.3

Sleep Mode

When the INH pin is set to low, the driver will be set to sleep mode. The INH pin switches off the complete supply

structure of the device and leads finally to an undervoltage shut down of the complete driver. Enabling the device

with the INH pin means to switch on the supply structure. The device will run through power on reset during wake

up. It is recommended to perform a Reset by ENA after Wake up to remove possible ERR signals; Reset is

performed by keeping one or more ENA pins low until the charge pump voltages have ramped up.

Enabling and disabling with the INH pin is not very fast. For fast enable / disable the ENA pin is recommended.

When the TLE 7183 F is in INH mode (INH is low) or when the supply voltage is not available on the Vs pin, then

the driver IC is not supplied, the charge pumps are inactive and the charge pump capacitors are discharged. Pin

CB2 (+ terminal of buffer capacitor 2) will decay to GND. When the battery voltage is still applied to VDH (- terminal

of buffer capacitor 2) the buffer capacitor 2 will slowly charged to battery voltage, yet with reversed polarity

compared to the polarity during regular operation. Hence, it is important to use a buffer capacitor 2 (CB2) that can