LM5060 datasheet(21/33 Pages) TI

21 / 33 page

VINMAX = OVPTH +

R8 x OVPTH

VINMIN = UVLOTH +

UVLOTH

R11

R10 x UVLOBIAS +

R8 = R9 x

VINMAX - OVPTH

OVPTH

R10 =

VINMIN - UVLOTH

UVLOTH

R11

UVLOBIAS +

OVP

VIN

LM5060

R10

OVPTH

2.00V

UVLO

UVLOTH

1.60V

UVLOBIAS

5.5 PA

VIN

R11

LM5060

www.ti.com

SNVS628F – OCTOBER 2009 – REVISED APRIL 2013

Figure 30. Programming the Thresholds with Resistors R8-R11

Choose the upper UVLO thresholds to ensure operation down to the lowest required operating input voltage

(VINMIN). Select R11 based on resistive divider current consumption and noise sensitivity. A value less than 100

Ω is recommended, with lower values providing improved immunity to variations in ULVOBIAS.

(12)

To calculate the UVLO low threshold including its hysteresis, use (UVLOTH-UVLOHYS) instead of UVLOTH in the

formula above. Choose the lower OVP threshold to ensure operation up to the highest VIN voltage required

(VINMAX). Select R9 based on resistive divider current consumption A value less than 100 kΩ is recommended.

(13)

To calculate the OVP low threshold including hysteresis, use (OVPTH-OVPHYS) instead of OVPTH. Where the R9-

R11 resistor values are known, the threshold voltages are calculated from the following:

(14)

Also in these two formulas, the respective low value including the threshold hysteresis is calculated by using

(UVLOTH-UVLOHYS) instead of UVLOTH and (OVPTH-OVPHYS) instead of OVPTH. The worst case thresholds, over

the operating temperature range, can be calculated using the respective minimum and maximum values in bold

font in the Electrical Characteristics.

Option C: The OVP function can be disabled by grounding the OVP pin. The UVLO thresholds are set as

described in Figure 30.

POWER GOOD INDICATOR

A resistor between a supply voltage and the nPGD pin limits the current into the nPGD pin in a logic low

condition. A nPGD pin sink current in the range of 1 mA to 5 mA is recommended. The example in Figure 31

connects the nPGD pull-up resistor R4 to the VIN pin. Any positive supply voltage less than 65V may be used

instead of VIN.

Submit Documentation Feedback

Product Folder Links: LM5060

LM5060 Datasheet(PDF) 21 Page - Texas Instruments

LM5060 Datasheet(HTML) 21 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

Datasheet Download

Link URL