M62212GP 查看數據表（PDF） - Renesas Electronics

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M62212GP

General Purpose DC/DC Converter

Renesas Electronics 

M62212P/FP/GP

2) DTC

The dead time control is set by installing a resistor between the DTC terminal and GND. However, the DTC

terminal serves as the short protection circuit also. Therefore, its set up depends on whether the short protection

circuit is used and not.

 When the short protection circuit is used

At this time, the charge current for DTC is approximately 10 µA. Therefore, RDTC should be set to 40 kΩ to 110

kΩ.

 When the short protection circuit is not used

At this time, the charge current for DTC is approximately 45 µA. Therefore, RDTC is set to 12 kΩ to 25 kΩ.

3) Short protection circuit

The short protection circuit used the timer latch system. It is determined by setting the capacity used for the soft

start connected to the DTC terminal.

Figure 3 shows the short protection circuit and the timing chart for various modes.

When the power is turned on, the FB terminal goes high (approx. 2.3 V) and the DTC terminal goes low. (goes up

slowly from 0 V) Thus, approximately 45 µA current will flow when SW1: ON and SW2: OFF. The potential,

namely the potential of the FB terminal is in the amplitude of the triangular wave, SW1 will be OFF and SW2 will

be ON and approximately 50 µA will flow into the DTC terminal. This discharge current will cause the DTC

terminal to drop from 1.15 V.

At this time, if the potential of the FB terminal goes to the control potential before the potential at the DTC terminal

goes lower than 0.45 V which is the lower limit value of the triangular wave and if the potential of the FB terminal

is lower than the potential of the DTC terminal, then the system is activated.

When the output is shorted, the system is either activated or latched depending on whether the time for the high

potential of the FB terminal reaches the potential of the control state is long or short. (For detail, see [II] and [IV] of

the Mode)

There are two ways to go back to operation after the latch to shut off output. Either method can restart with soft

start.

1. Turning ON the VCC.

2. Make the FB terminal to go to the low potential of 1.86 V or less. Then, it is cancelled.

[Mode Explained]

[I] Mode………… Activation

This is used when the FB terminal goes down to the control state potential when the DTC terminal is in up

slope. In order for the activation to occur when the DTC terminal is in down slope, the FB terminal potential

must go below the DTC terminal before the DTC terminal goes to 0.45 V.

[II] Mode…........... Output short → Activation

The system is activated if the FB terminal potential goes below the DTC terminal potential before the DTC

terminal goes to 0.45 V. If there is not enough time, the output is turned OFF. (Latched)

[III] Mode….......... ON/OFF control → Activation

This mode turns off the output by forcing the DTC terminal to go down. (The system) returns as in the case

of the activation.

[IV] Mode….......... Output short (Latch)

The output is turned OFF when the FB terminal potential did not go down to the control state before the DTC

terminal went down to 0.45 V.

Rev.2.00 Jun 14, 2006 page 5 of 8

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