ZXBM2001 查看數據表（PDF） - Diodes Incorporated.
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ZXBM2001 Datasheet PDF : 10 Pages
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ZXBM2001
ZXBM2002 ZXBM2003
Locked Rotor timing capacitor (CONT).
C
C
TPWM = IPWMC + IPWMD
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
- external PWM input
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:
(VTHH - VTHL) × C (VTHH − VTHL) × C
Tlock =
IPWMC
+
IPWMD
Where TPWM is in s
The CPWM pin can also be used as in input for an
externally derived PWM signal to control the motor
speed. The signal should have a VOL <1V and a VOH
>2V. A standard TTL or CMOS digital signal is ideal.
When driving from an external PWM source no
capacitor should be attached to the CPWM pin and the
SPD pin should be left open circuit.
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.
C = CPWM +15 in pF
IPWM & IPWMD are in A
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:
SEMICONDUCTORS
6
ISSUE 4 - OCTOBER 2004
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