ZXBM2004N14TC Diodes Zetex, ZXBM2004N14TC Datasheet - Page 6

• Manufacturer Part Number: ZXBM2004N14TC
• Description: IC DC FAN CTRLR 2PHASE 14SOIC
• Manufacturer: Diodes Zetex

Specifications of ZXBM2004N14TC

• Applications: DC Motor Controller, Brushless (BLDC), 2 Phase
• Number Of Outputs: 1
• Voltage - Supply: 4.7 V ~ 18 V
• Operating Temperature: -40°C ~ 110°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Voltage - Load: -

T
As these threshold voltages are nominally set to V
3V and V
follows:
C
Should the fan stop rotating for any reason, i.e. an
obstruction in the fan blade or a seized bearing, then
the device will enter a Rotor Locked condition. In this
condition after a predetermined time (T
will go high and the Phase outputs will be disabled.
After a further delay (T
the Phase drive for a defined period (T
to re-start the fan. This cycle of (T
repeated indefinitely or until the fan re-starts.
GND - Ground
This is the device supply ground return pin and will
generally be the most negative supply pin to the fan.
RD - Locked Rotor error output
This pin is the Locked Rotor output as referred to in the
C
stopped and low when it is running.
This is an open collector drive giving an active pull
down with the high level being provided by an external
pull up resistor.
ZXBM2004
PWM
LCK
LCK
S E M I C O N D U C T O R S
=
timing section above. It is high when the rotor is
- Locked rotor timing capacitor
I
PWMC
2
C
THL
+
= 1V the equations can be simplified as
I
PWMD
2
C
OFF
) the controller will re-enable
OFF
) and (T
ON
LOCK
) in an attempt
) the RD pin
ON
) will be
THH
=
6
FG - Frequency Generator (speed) output
This is the Frequency Generator output and is a
buffered signal from the Hall sensor.
This is an open collector drive giving an active pull
down with the high level being provided by an external
pull up resistor.
Ph1Lo & Ph2Lo - Driver
This pair of outputs drive the external devices. These
outputs provide both the commutation and PWM
waveforms. The outputs are of the Darlington emitter
follower type with an active pull-down to help faster
switch off when using bipolar devices. When in the
high state the outputs will provide up to 80mA of drive
into the base or gates of external transistors as shown
in the Typical Application circuit following.
When in the low state the active Phase drive is capable
of sinking up to 16mA when driving low to aid turn off
times during PWM operation. When the Phase is
inactive the output is held low by an internal pull-down
resistor.
V+OP - Phase Outputs Supply Voltage
This pin is the supply to the Phase outputs and will be
connected differently dependant upon external
transistor type.
For bipolar devices this pin will be connected by a
resistor to the V
the current into the transistor base so its value is
chosen accordingly.
For MOSFET devices the pin will connect directly to the
V
CC
pin.
CC
pin. The resistor is used to control
ISSUE 3 - MAY 2005