UCD3138ARMHT datasheet(20/87 Pages) TI1

20 / 87 page

EAP0

EAN0

DAC0

EADC

4 bit dithering gives 14 bits of effective resolution

97.65625 µV/LSB effective resolution

6 bit ADC

8 mV/LSB

Signed 9 bit result

(error) 1 mV /LSB

AFE_GAIN

10 bit DAC

1.5625 mV/LSB

Value

Dither

CPCC

Filter x

Ramp

SAR/Prebias

Absolute Value

Calculation

Averaging

10 bit result

1.5625 mV/LSB

3-AFE_GAIN

Peak Current Mode

Comparator

Peak Current

Detected

AFE_GAIN

EAP

AGND

EAN

AGND

IOFFSET

REA

IOFFSET

REA

Front-end differential amplifier

UCD3138A

SLUSC66C – MARCH 2015 – REVISED SEPTEMBER 2016

www.ti.com

Submit Documentation Feedback

Product Folder Links: UCD3138A

Specifications

Figure 5-3. Input Stage of EADC Module

Figure 5-4. Front End Module

(Front End 2 Recommended for Peak Current Mode Control)

5.7.1.2

DPWM Module

The DPWM module represents one complete DPWM channel with 2 independent outputs, A and B.

Multiple DPWM modules within the UCD3138A system can be configured to support all key power

topologies. DPWM modules can be used as independent DPWM outputs, each controlling one power

supply output voltage rail. It can also be used as a synchronized DPWM—with user selectable phase shift

between the DPWM channels to control power supply outputs with multiphase or interleaved DPWM

configurations.

The output of the filter feeds the high resolution DPWM module. The DPWM module produces the pulse

width modulated outputs for the power stage switches. The compensator calculates the duty ratio as a 24-

bit number in Q23 fixed point format (23 bit integer with 1 sign bit). This represents a value within the

range 0.0 to 1.0. This duty ratio value is used to generate the corresponding DPWM output ON time. The

resolution of the DPWM ON time is 250 psec.

UCD3138ARMHT датащи(PDF) 20 Page - Texas Instruments

UCD3138ARMHT датащи(HTML) 20 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 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87

датащи скачать

ссылки URL