LB1877 Sanyo, LB1877 Datasheet - Page 5

• Manufacturer Part Number: LB1877
• Description: Brushless Motor Driver with Speed Control for Portable Cassette Recorders
• Manufacturer: Sanyo

Pin Description
Pin number
18
12
14
13
15
10
9
7
8
Pin name
VREF
GND
COM
VCC
OSC
OUT
VSP
IN+
RI
0.1V to
1.8V to 5.0V
0.7V to 0.9V
1.3V to Vcc
Pin voltage
Vcc – 0.7V
1V to Vcc
To UOUT
To comparator input
20k
To VOUT
LB1877M
Equivalent circuit
20k
10k
To WOUT
200
20k
13
To U,V,WOUT
10k 10k 10k
5k
15
1k
10k
Drive
current
200
7
50k
200
10
8
12
14
20k
I
Unit (resistance: , capacitance: F)
Power supply for all circuits
Ground for all circuits except
FC and power block.
Internal reference voltage.
Connected as speed control
voltage to IN+ pin via external
resistor.
Startup oscillator pin.
Adjusts self-excitation
frequency via external
capacitor.
Determines threshold voltage
of waveform detection circuit.
Connected to Vcc via an
external resistor.
Varies the startup threshold
voltage.
Peak detection circuit output
pin.
Error amplifier non-inverted
pin.
Controls rotation speed via
input pin voltage.
Error amplifier output pin.
Connect external resistor
between Vsp pins for
feedback.
Current feedback output pin.
Connect external resistor
between this pin and ground
for current feedback
adjustment.
Continued on next page
Pin function
No. 6199-5/7