LB11988HR Datasheet, PDF (5/8 Pages) Sanyo Semicon Device – Fan Motor Driver

Pin Functions
Pin
Pin Name
No.
VCC
21
GND
7
FRAME
UIN+, UIN- 12,13
VIN+, VIN-
14,17
WIN+,WIN- 18,19
UOUT
27
VOUT
28
WOUT
1
RF
23
VS
22
FR
6
LB11988HR
Input/Output Equivalent Circuit
Each (+) input
18
14
12 ^200Ω
Each (-) input
19
17
200Ω ₁₃
Pin Functions
Power supply pin for supplying power to
all circuits expect output section in IC;
this voltage must be stabilized so as to
eliminate ripple and noise.
GND for others than the output transistor.
Minimum potential of output transistor is
at RF pin.
U-phase Hall device input pin;
logic “H” presents IN+>IN-
V-phase Hall device input pin;
logic “H” presents IN+>IN-
W-phase Hall device input pin;
logic “H” presents IN+>IN-
23 RF
22 VS
Each OUT
27 28 1
200Ω
VCC
VCC
Lower oversaturation
prevention circuit
block
U-phase output pin.
V-phase output pin.
W-phase output pin.
(Built-in spark killer diode)
Output current detection pin.
Connecting Rf between this pin and GND
activates current limiting circuit. Then the
lower over-saturation prevention circuit is
activated in accordance with this pin
voltage. Since the over-saturation
prevention level is set with this voltage,
the lower over-saturation prevention effect
may deteriorate in the high current range
if the Rf value is reduced to an extremely
low level.
Power supply pin for supplying power to
output section in IC.
Forward/Reverse switching pin.
FR 6
200Ω
Continued on next page.
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