ZXBM2004Q16TC(2005) 查看數據表（PDF） - Diodes Incorporated.

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ZXBM2004Q16TC
(Rev.:2005)

VARIABLE SPEED 2-PHASE BLDC MOTOR CONTROLLER

Diodes Incorporated. 

ZXBM2004

PIN FUNCTIONAL DESCRIPTION

H+ - Hall input

H- - Hall input

The rotor position is detected by a Hall sensor, with the

output applied to the H+ and H- pins. This sensor can be

either a 4 pin 'naked' Hall device or of the 3 pin buffered

switching type. For a 4 pin device the differential Hall

output signal is connected to the H+ and H- pins. For a

buffered Hall sensor the Hall device output is attached

to the H+ pin, with a pull-up attached if needed, whilst

the H- pin has an external potential divider attached to

hold the pin at half Vcc. When H+ is high in relation to

H-, Ph2 is the active drive.

ThRef - Network Reference

This is a reference voltage of nominal 3V. It is designed

for the ability to 'source' and therefore it will not 'sink'

any current from a higher voltage.

The current drawn from the pin by the minimum speed

potential divider to pin SMIN and any voltage setting

network should not exceed 1mA in total at maximum

temperature.

If required this pin can also be used as an enable pin.

The application of a voltage >3.0V will force the PWM

drive fully off, in effect disabling the drive.

SMIN - Sets Minimum Speed

A voltage can be set on this pin via a potential divider

between the ThRef and Gnd. This voltage is monitored

by the SPD pin such that it cannot rise above it. As a

higher voltage on the SPD pin represents a lower speed

it therefore restricts the lower speed range of the fan. If

this feature is not required the pin is left tied to ThRef so

no minimum speed will be set.

If the fan is being controlled from an external voltage

source onto the SPD pin then either this feature should

not be used or if it is required then a >1k⍀ resistor

should be placed in series with the SPD pin.

CPWM - Sets PWM Frequency

This pin has an external capacitor attached to set the

PWM frequency for the Phase drive outputs. A

capacitor value of 0.1nF will provide a PWM frequency

of typically 24kHz.

SPD - Speed Control Input

The voltage applied to the SPD pin provides control

over the Fan Motor speed by varying the Pulse Width

Modulated (PWM) drive ratio at the Ph1Lo and Ph2Lo

outputs. The control signal takes the form of a voltage

input of range 3V to 1V, representing 0% to 100% drive

respectively.

If variable speed control is not required this pin can be

left with an external potential divider to set a fixed

speed or tied to ground to provide full speed i.e. 100%

PWM drive.

The CPWM timing period (TPWM) is determined by the

following equation:

TPWM

=

(VTHH

− VTHL)

I PWMC

xC

+

(VTHH

− VTHL)

I PWMD

x

C

Where:

C = CPWM +15, in pF

VTHH and VTHL are the CPWM pin

threshold voltages

IPWMC and IPWMD are the charge and

discharge currents in ␮A.

TPWM is in ms

ISSUE 3 - MAY 2005

5

SEMICONDUCTORS

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