ZXBM2001(2002) データシートの表示（PDF） - Zetex => Diodes

部品番号

コンポーネント説明

メーカー

ZXBM2001
(Rev.:2002)

VARIABLE SPEED 2-PHASE FAN MOTOR CONTROLLER

Zetex => Diodes 

ZXBM2001

ZXBM2002 ZXBM2003

Locked Rotor timing capacitor (CONT).

The CLCK timing periods are determined by the

following equations:

VTHH × CLCK

Tlock =

ILCKC

(VTHH − VTHL) × CLCK

Toff =

ILCKD

(VTHH − VTHL) × CLCK

Ton =

ILCKC

Where VTHH and VTHL are the CLCK pin threshold

voltages and ILCKC and ILCKD are the charge and

discharge currents.

9. PH2 - External transistor driver

10. PH1 - External transistor driver

These are the Phase drive outputs and are open

darlington emitter followers designed to provide up to

80mA of drive to external transistors as shown in the

Application circuits following. The external transistors

in turn drive the fan motor windings.

Lock and FG Timing Waveform:

As these threshold voltages are nominally set to

VTHH=2V and VTHL=1V the equations can be simplified

as follows:

2 × CLCK

Tlock = ILCKC

CLCK

Ton = ILCKC

CLCK

Toff = ILCKD

8. 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 0.15nF will provide a PWM

frequency of typically 24kHz.

The CLCK timing period (Tpwm) is determined by the

following equation:

Lock Timing Example:

(VTHH − VTHL) × CPWM (VTHH − VTHL) × CPWM

Tpwm =

IPWMC

+

IPWMD

Where VTHH and VTHL are the CPWM pin threshold

voltages and IPWMC and IPWMD are the charge and

discharge currents.

As these threshold voltages are nominally set to

VTHH=2V and VTHL=1V the equations can be simplified

as follows:

CPWM CPWM

Tpwm = IPWMC + IPWMD

Using the equation previously described and to be

found under the CLCK pin description:

2 × CLCK

Tlock = ILCKC

CLCK

Ton = ILCKC

CLCK

Toff = ILCKD

Using a value of CLCK = 1.0uF together with the values

of ILCKC and ILCKD to be found in the Electrical

Characteristics we can derive the following timings for

operation at 12V and 25°C.

2 × 1.0␮F

Tlock = 2.8␮A = 0.714s

1.0␮F

Toff = 0.28␮A = 3.6s

2 × 1.0␮F

Ton = 2.8␮A = 0.36s

ISSUE 1 - APRIL 2002

5

Share Link: