Datasheet

Configuration

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5.1 Current Limit Trip Selection (J8: Trip Select)

The overcurrent protection (OCP) can be set by J8 Trip Select.

Default setting is 30 mV.

Table 2. Current Limit Trip Selection

Jumper Set To Trip Select OCP Limit per Phase (Typical)

Top (7-8 pin shorted) GND (15 mV) 15.1 A

Second (5-6 pin shorted) VREF (20 mV) 18.4 A

Third (3-4 pin shorted) 3.3VBIAS (25 mV) 22.3 A

Bottom (1-2 pin shorted) V5FILT(30 mV) 27.9 A

5.2 Frequency Selection (J7: TON Select)

The operating frequency can be set by J7 TON Select.

Default setting is 300 kHz.

Table 3. Frequency Selection

Jumper Set To TON Select Frequency (kHz)

Top (7-8 pin shorted) GND 200

Second (5-6 pin shorted) VREF 300

Third (3-4 pin shorted) 3.3VBIAS 400

Bottom (1-2 pin shorted) V5FILT 500

5.3 Overshoot Reduction Selection (J9: OSR™ Select)

The overshoot reduction can be set by J9 OSR™ Select.

Default setting is Minimum.

Table 4. Overshoot Reduction Selection

Jumper Set To OSR Overshoot Voltage

Top (7-8 pin shorted) GND (Minimum) Minimum

Second (5-6 pin shorted) VREF (Medium) Medium

Third (3-4 pin shorted) 3.3VBIAS (Maximum) Maximum

Bottom (1-2 pin shorted) V5FILT (Off) OSR Off

5.4 VID Bits Selection (S1)

The output voltage can be set by Switch S1(VID Bits).

Default setting is 0000.

Table 5. VID Bits Selection

(1)

VID3 VID2 VID1 VID0 Vout(V)

0 0 0 0 1.250

0 0 1 1 1.175

0 1 0 1 1.125

0 1 1 1 1.075

1 0 0 1 1.025

1 0 1 1 0.975

(1)

4-Bit VID Table (1=3.3VBIAS=on, 0=GND=off)

Using the TPS51727EVM, a Dual-Phase, Eco-mode™ Step-Down Power SLUU379–November 2009

Management IC for 40-A+ Application

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