TCC-103B-RT datasheet(11/29 Pages) ONSEMI

Part #	TCC-103B-RT

Description	PTIC Control IC

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TCC−103

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11

Boost Control

The TCC−103 integrates an asynchronous current control

boost converter. It operates in a discontinuous mode and

features spread-spectrum circuitry for Electro-Magnetic

Interference (EMI) reduction. The average boost clock is

2 MHz and the clock is spread between 0.8 MHz and

3.2 MHz.

Boost Output Voltage (VHV) Control Principle

The asynchronous control starts the boost converter as

soon as the VHV voltage drops below the reference set by

the 4-bit DAC and stops the boost converter when the VHV

voltage rises above the reference again.

Due to the slow response time of the control loop, the

VHV voltage may drop below the set voltage before the

control loop compensates for it. In the same manner, VHV

can rise higher than the set value. This effect may reduce the

maximum output voltage available. Please refer to Figure 6

below.

The asynchronous control reduces switching losses and

improves the output (VHV) regulation of the DC/DC

converter under light load, particularly in the situation

where the TCC−103 only maintains the output voltages to

fixed values.

Figure 6. VHV Voltage Waveform

Boost Running

CHV

Recharge

CHV

Discharge

Time

Delay

VHV

Set VHV

High Impedance (High Z) Feature

In Shutdown mode the OUT pins are set to a high

impedance mode (high Z).

Following is the principle of operation for the control IC:

1. The output voltage VOUT is defined by:

VOUT +

DAC code

255

24 V

2

(eq. 1)

2. The voltage VHV defines the maximum supply

voltage of the output regulator and is set by the

4 bit DAC.

3. The maximum DC output voltage VOUT is limited

to (VHV − 2 V).

4. The minimum output voltage VOUT is 1.0 V

MAX.

Figure 7. DAC Output Range Example A

Figure 8. DAC Output Range Example B

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TCC-103B-RT Datasheet(PDF) 11 Page - ON Semiconductor

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