L6730C datasheet(40/50 Pages) STMICROELECTRONICS

40 / 50 page

I/O Description

L6730C - L6730D

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I/O Description

Figure 35. Demoboard

Table 10.

I/O Functions

Symbol

Function

Input (VIN-GIN)

The input voltage can range from 1.8V to 14V. If the input voltage is between 4.5V and 14V

it can supply also the device (through the VCC pin) and in this case the pin 1 and 2 of the

jumper G1 must be connected together.

Output (VOUT-GOUT)

The output voltage is fixed at 3.3V but it can be changed by replacing the resistor R14 of the

output resistor divider:

The over-current-protection limit is set at 15A but it can be changed by replacing the

resistors R1 and R12 (see OCL and OCH pin in Table 3: Pins connection).

VCC-GNDCC

Using the input voltage to supply the controller no power is required at this input.

However the controller can be supplied separately from the power stage through

the VCC input (4.5-14V) and, in this case, jumper G1 must be left open.

VCCDR

An internal LDO provides the power into the device. The input of this stage is the VCC pin

and the output (5V) is the Vccdr pin. The LDO can be bypassed, providing directly a 5V

voltage from VCCDR and Gndcc. In this case the pins 1 and 3 of the jumper G1 must be

shorted.

TP1

This pin can be used as an input or as a test point. If all the jumper G2 pins are shorted, TP1

can be used as a test point of the voltage at the EAREF pin. If the pins 2 and 3 of G2 are

connected together, TP1 can be used as an input to provide an external reference for the

internal error amplifier (see section 4.3. Internal and external references).

TP2

This test point is connected to the Tmask pin (see Table 3: Pins connection).

TP3

This test point is connected to the S/O/U pin (see Chapter 5.10 on page 25).

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REF

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