Download TRKx 64D82AR Datasheet C PDF

TitleTRKx 64D82AR Datasheet C
TagsTechnology Manufactured Goods Capacitor Analog To Digital Converter
File Size234.2 KB
Total Pages11
Document Text Contents
Page 1

Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com

1

Power System Sequencer
TRKF-64D82AR, TRKA-64D82AR

February 7, 2014 Bel Power Inc., a subsidiary of Bel Fuse Inc.


Features
Digital Signal Processor (DSP) Based with Bel Firmware
Provides Power Up and Power Down Sequencing Logic
Stand Alone or Command Based Feature Set
Fault Detection and Reporting
64-Pin 10mm x 10mm TQFP package
I2C, SMBus, or PMBus compatible serial interface options
Configurable through serial interface, Customizable through software
3V3 logic levels
Voltage Margining via Closed Loop Trim
Analog Input Monitoring
Programmed parameters saved in non-volatile memory
Intelligent configuration capability
Power-down data log for identifying fault conditions
Boot loader for in-system upgrading




Applications
Data Storage Servers
Networking
Telecommunications


Description
This on board power system controller provides a cost effective high performance solution for controlling,
monitoring, and sequencing multiple Point of Load (POL) converters on a system board. The sequencer uses a
digital signal processor (DSP) engine and Bel’s firmware to implement a portfolio of board level control features
typically required in a multiple voltage configuration. This device can control and monitor up to eight PoL
converters and monitor up to four analog inputs. The 64 pin TRKx-64D82AR part is derived from the TRKx-
64D82ER but does not include support for VRMs or the associated thermal trip inputs. Instead, it provides
support to check the ramp of a soft start input and also supports 12-bit analog to digital conversions.



On Board Power System Controller RoHS Compliant Rev. C

Page 2

Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com

2

Power System Sequencer
TRKF-64D82AR, TRKA-64D82AR

February 7, 2014 Bel Power Inc., a subsidiary of Bel Fuse Inc.


Cfilter

Rfilter Rlimit
Trim

Enable

Vin

Vout

GND

Vout ADC Input

Digital Output

Trim PWM

Vin Monitor

I2C
SDA

SCL

Vin

Digital
Commands

A
B
C/Optional SS for SPI

Communication
and

Command Interface

Control Grouping 1 of n

PoL 1 of n Vout 1of n

Optional Feature Sets

EE^2 Data Logging
Input Inrush Control




Figure 1
Functional Block Diagram

I/O Definitions
Pin Function I/O Type or Description 5V Tolerant

1 PoL 7 Enable Digital Output
2 PoL 8 Enable Digital Output
3 Reset B Out Digital Output
4 Reset C Out Digital Output Y
5 Margin Lo Digital Input Y
6 Margin Hi Digital Input Y
7 MCLR MCLR - For ICD2 Programming Y
8 Board Seated Digital Input Y
9 Vss Logic GND

10 Vdd 3.3V VDD
11 PoL Monitor 4 Analog Input
12 PoL Monitor 3 Analog Input
13 PoL Monitor 2 Analog Input
14 PoL Monitor 1 Analog Input
15 Reference Return Analog GND
16 Reference Input 3.0V Reference
17 PoL Monitor 5 Analog Input
18 PoL Monitor 6 Analog Input
19 AVDD Analog 3.3V VDD
20 AVSS Analog GND
21 PoL Monitor 7 Analog Input
22 PoL Monitor 8 Analog Input
23 mfg_mode Analog Input
24 Analog A Monitor Analog Input

Page 5

Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com

5

Power System Sequencer
TRKF-64D82AR, TRKA-64D82AR

February 7, 2014 Bel Power Inc., a subsidiary of Bel Fuse Inc.
Using the PWM Trim Outputs



Reference

Ry

Rz

+Sense

Rx
TRIM

PWM

+Vin

+Vout

Zf

Zi -

+

E/A


Figure 3A.



Reference

+Sense

PWM

+Vin

+Vout

Zf

Zi -

+

E/A

Rx
TRIM

Ry


Figure 3B.


+Sense

PWM

+Vin

+Vout

Zf

Zi -

+

E/A

TRIM uController
or Equivalent

Reference


Figure 3C.

Page 6

Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com

6

Power System Sequencer
TRKF-64D82AR, TRKA-64D82AR

February 7, 2014 Bel Power Inc., a subsidiary of Bel Fuse Inc.
The drawings in figure 3 show the three most common trim methods used in PoL converters. In all of these
schemes a power conversion stage contains a PWM device that receives a control voltage from an error
amplifier. The error amplifier (E/A) compares a scaled version of the output voltage to a reference. The output
voltage of the converter module is simply the reciprocal of the scaling factor multiplied by the reference value.
The output voltage can be adjusted by changing this scaling factor (Figure 3A) or by modifying the reference
(Figures 3B, C).

The most common trim method is shown in figure 3A. The popularity of this method stems from the fact that
most highly integrated PWM control IC’s have an internal reference that is not accessible and cannot be
controlled externally. In this scheme the output is scaled by adding a resistor from the trim pin to ground. This
modifies the feedback divider and moves the output voltage to a higher value. The output can also be modified
by superimposing an offset voltage on the feedback divider by connecting a voltage source to the trim pin
through a resistor. Either of these two approaches will move the output voltage to a new value. The common
characteristic of modules with this trim scheme is that a lower value trim resistor to ground will cause a higher
output voltage or a larger voltage superimposed on the trim pin will cause Vout to decrease.

Some PoL converters incorporate the trim scheme shown in figure 3B. With this method the feedback ratio is
kept constant and the reference value is modified to move the output voltage. The common characteristic of
modules with this trim scheme is that a lower value trim resistor to ground will cause a lower output voltage and
a larger voltage superimposed on the trim pin will cause Vout to increase.

The method shown in figure 3C is occasionally used. This is similar to the method in figure 3B except the
modification of the reference is mapped through a device such as a microcontroller. This is the least common of
the 3 methods and requires the vendor’s data sheet to determine the trim characteristic because the micro
controller can map the reference in many different ways.


Ra

Ca

Rb
Margin PWM PoL Trim Pin

3V3

0

VTrim Average

VTrim Ripple


Figure 4A

Ra

Ca

Rb
Margin PWM PoL Trim Pin

3V3

0
VTrim Average

VTrim Ripple

PoL Vout
or

VDD


Figure 4B


The power sequencer has the ability to do independent closed loop trim and closed loop margining of the output
voltage for each PoL controlled by the device. Each PoL’s output voltage is monitored and by an analog to
digital converter (ADC) in a continuous loop. In firmware the most recent measured output voltage is compared
against the desired value and the PoL’s output is adjusted by delivering a trim value to the corresponding PoL’s
trim pin. This trim voltage is created from a digital PWM output and an external low pass filter. Each digital
PWM is labeled <PoL “n” Margin PWM> where n indicates a specific converter which corresponds to the
monitoring channel labeled with the same “n” value. The external low pass filter creates a DC value from the
PWM signal which is then delivered to each PoL converter through a range limiting resistor.

Figure 4 shows the typical circuits used to interface the sequencers Margin PWM signals to PoL converters. In
each of the circuits shown Ra and Ca construct a low pass filter while Rb is used to limit the trim range. The
effective trim voltage is equal to the Margin PWM duty cycle multiplied by VDD and is controllable in 1024 steps
from 0 to VDD. The effective trim resistor value is equal to Ra + Rb. Ra and Ca are chosen to reduce the trim
voltage ripple. Typical values for Ra and Ca are 1K for Ra and 0.22uF to 1uF for Ca. Rb is used to limit the
control range and should be selected based on the desired control range and the trim equation for the PoL.

Page 10

Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 • Tel 201-432-0463 • Fax 201-432-9542 • www.belfuse.com

10

Power System Sequencer
TRKF-64D82AR, TRKA-64D82AR

February 7, 2014 Bel Power Inc., a subsidiary of Bel Fuse Inc.
Mechanical Outline


Bel 64-pin 10x10x1mm TQFP Sequencer

Figure 5A


64-Lead Plastic Thin-Quad Flatpack, 10 x 10 x 1mm Body
Units Millimeters

Dimension Units Min Nom Max
Number of Leads N 64
Lead Pitch e 0.50 BSC
Leads per side n1 16
Overall Height A - - 1.20
Molded Package Thickness A2 0.95 1.00 1.05
Standoff A1 0.05 - 0.15
Foot Length L 0.45 0.60 0.75
Footprint L1 1.00 REF
Foot Angle φ 0˚ 3.5˚ 7˚
Overall Width E 12.00 BSC
Overall Length D 12.00 BSC
Molded Package Width E1 10.00 BSC
Molded Package Length D1 10.00 BSC
Lead Thickness c 0.09 - 0.20
Lead Width b 0.17 0.22 0.27
Mold Draft Angle Top α 11˚ 12˚ 13˚
Mold Draft Angle Bottom β 11˚ 12˚ 13˚
Notes:
1. Pin 1 visual index feature may vary, but must be located within the hatched area.
2. Champers at corners are optional; size may vary.
3. Dimensions D1 and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.25 mm per side.
4. Dimensioning and tolerancing per ASME Y14.5M.
BSC: Basic Dimension. Theoretically exact value shown without tolerances.
REF: Reference Dimension, usually without tolerance, for information purposes only.

Figure 5B

Page 11

2010 Bel Fuse Inc. Specifications subject to change without notice.

11
CORPORATE FAR EAST EUROPE

Bel Fuse Inc. Bel Fuse Ltd. Bel Fuse Europe Ltd.
206 Van Vorst Street 8F/ 8 Luk Hop Street Preston Technology Management Centre
Jersey City, NJ 07302 San Po Kong Marsh Lane, Suite G7, Preston
Tel 201-432-0463 Kowloon, Hong Kong Lancashire, PR1 8UD, U.K.
Fax 201-432-9542 Tel 852-2328-5515 Tel 44-1772-556601
www.belfuse.com Fax 852-2352-3706 Fax 44-1772-888366
www.belfuse.com www.belfuse.com


Power System Sequencer
TRKF-64D82AR, TRKA-64D82AR

February 7, 2014 Bel Power Inc., a subsidiary of Bel Fuse Inc.
Revision History

Date Revision Changes Detail Approval

2010-2-22 A First preliminary draft. S. Moore

2010-7-19 B
Reformatted document.
Added Program Flash Memory Cell Endurance specification.
Added TRKA-64D82AR.

S. Moore

2014-2-7 C Added information about 5V tolerant pins. S. Moore



Errata
Refer to TRKx-64D82AR Errata document for additional information specific to each code release.






















































RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and
other hazardous substances from electronic products.

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