
LB1620
No.1210-4/6
Pin Description
Pin name
Pin No.
Function
UIN1, UIN2
VIN1, VIN2
WIN1, WIN2
13, 14
15, 16
17, 18
U phase Hall element input pin, "H" of logic : VIN1>VIN2
V phase Hall element input pin, "H" of logic : VIN1>VIN2
W phase Hall element input pin, "H" of logic : VIN1>VIN2
UOUT
VOUT
WOUT
3
2
1
U phase output pin
V phase output pin
W phase output pin
VCC1
4
Power supply pin for applying output
VCC2
19
Power supply pin for applying voltage to each section other than output section.
The control point of control voltage is at approximately 1/2 of this voltage.
This voltage must be stabilized to be free from ripple, noise, etc.
Rf
20
Output current detect pin. By connecting Rf across this pin and GND pin, output
current is detected as voltage.
CD
10
Pin for fetching current (voltage) detected with Rf.
By connecting a resistor across CD pin and Rf, speed control start voltage can be
fine-adjusted.
STOP
9
Overcurrent protection pin.
Voltage being lower than that on CD pin is taken to be identical to overcurrent
flow, causing output to be cut off. Off-state is held.
For example, if STOP pin is set to 1.5V for Rf=1Ω, approximately 1.5A or more
flows at output, causing output to be cut off.
FCU
FCV
FCW
5
6
7
Frequency characteristic compensation pin.
Closed loop oscillation in current-controlled system (including motor, F/V
converter) is stopped.
VC
11
Speed/phase control pin.
Control starts at approximately 1/2 of VCC2.
Control is of current-controlled type that controls output current.
For Rf=1Ω, LB1620 closed loop has gm of 0.44A/V typ, which can be adjusted by
varying Rf.
GND
8
GND for other than output.
Minimun potential of output transistor is at Rf pin.
F/RC
12
Forward/reverse rotation control pin.
By setting this pin to "H" (more than 2V) / "L" (less than 0.3V), truth value is
changed to perform forward/reverse rotation.
Sample Application Circuit
Unit (resistance :
Ω, capacitance : F)
(Stabilization)
Power supply for Hall element
Forward/reverse select
Control signal input 2