TPS73601DBVT datasheet(17/51 Pages) TI

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Servo

Error

Amp

Ref

Current

Limit

Thermal

Protection

Bandgap

OUT

GND

80kW

8kW

27kW

4MHz

Charge Pump

1.2V

1.5V

1.8V

2.5V

2.8V

3.0V

3.3V

Short

23.2kW

28.0kW

39.2kW

44.2kW

46.4kW

52.3kW

Open

95.3kW

56.2kW

36.5kW

33.2kW

30.9kW

30.1kW

NOTE: VOUT = (R1 + R2)/R2 × 1.204;

R1||R 2 @ 19kW for best

accuracy.

Standard 1%

Resistor Values for

Common Output Voltages

Figure 6-2. Adjustable-Voltage Version

6.3 Feature Description

6.3.1 Output Noise

A precision band-gap reference is used to generate the internal reference voltage, VREF. This reference is

the dominant noise source within the TPS736 and generates approximately 32 μVRMS (10 Hz to 100 kHz) at

the reference output (NR). The regulator control loop gains up the reference noise with the same gain as the

reference voltage, so that the noise voltage of the regulator is approximately given by:

+ 32mVRMS

) R2)

+ 32mVRMS

OUT

REF

(1)

Since the value of VREF is 1.2 V, this relationship reduces to:

N(mVRMS)

+ 27

mVRMS

OUT(V)

(2)

for the case of no CNR.

An internal 27-kΩ resistor in series with the noise-reduction pin (NR) forms a low-pass filter for the voltage

reference when an external noise-reduction capacitor, CNR, is connected from NR to ground. For CNR = 10

nF, the total noise in the 10-Hz to 100-kHz bandwidth is reduced by a factor of approximately 3.2, giving the

approximate relationship:

N(mVRMS)

+ 8.5

mVRMS

OUT(V)

(3)

for CNR = 10 nF.

This noise reduction effect is shown as RMS Noise Voltage vs CNR in the Typical Characteristics section.

www.ti.com

TPS736

SBVS038V – SEPTEMBER 2003 – REVISED SEPTEMBER 2024

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