LB11988HR_12 Datasheet, PDF (6/6 Pages) Sanyo Semicon Device – Monolithic Digital IC Fan Motor Driver

Pin Functions
Pin No.
Pin name
7
FRAME
4
GND
FGOUT
6
FR
9
12, 13
14, 17
18, 19
21
FC
UIN+, UIN-
VIN+, VIN-
WIN+, WIN-
VCC
22
VS
23
RF
27
UOUT
28
VOUT
1
WOUT
LB11988HR
Function
Ground for circuits other than the output transistors.
Note that the Rf pin will be at the lowest potential of the output transistors.
This is the FG amplifier output pin. Internally, it is a resistive load. (Pull up)
Forward/reverse switching pin
Corrects the frequency characteristics of the saturation prevention circuit loop and current limiter circuit.
U-phase Hall input. Logic high refers to the state where IN+ > IN-.
V-phase Hall input. Logic high refers to the state where IN+ > IN-.
W-phase Hall input. Logic high refers to the state where IN+ > IN-.
Power supply provided to all IC internal circuits other than the output block.
This voltage must be stabilized so that ripple and noise do not enter the IC.
Output block power supply
Used for output current detection. The current limiter circuit operates using the resistor (Rf) connected between this
pin and ground.
Note that the lower side saturation prevention circuit operates according to the voltage that appears on this pin.
Since the over-saturation level is set by this voltage, the level of the lower side saturation prevention circuit may be
degraded in the large current region if the value of Rf is made extremely small.
U-phase Hall output.
V-phase Hall output. (These pins include internal spark killer diodes.)
W-phase Hall output.
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This catalog provides information as of February, 2012. Specifications and information herein are subject
to change without notice.
PS No.A0300-6/6