LB1952 Просмотр технического описания (PDF) - SANYO -> Panasonic

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LB1952

3-phase Brushless Motor Driver for VCR Capstans

SANYO -> Panasonic 

LB1952, 1952M

Control Function & Current Limit Function

Control characteristics

Current limit characteristics

Slope = 0.5 A/V typ

Pin Functions

The pin numbers in ( ) are for MFP.

Pin name

FR

GND

FGin (–)

FGin (+)

FG-OUT

CTL

CTLREF

LIM

FC

Uin+, Uin–

Vin+, Vin–

Win+, Win–

VCC

VS

ADJ

Rf (PWR)

Rf (SNS)

Uout

Vout

Wout

GSENSE

Pin No.

1 (33)

2 (34)

5 (3)

6 (4)

8 (5)

9 (6)

10 (7)

11 (8)

12 (9)

13, 14 (10, 11)

15, 16 (12, 13)

17, 18 (14, 15)

19 (16)

22 (21)

23 (22)

24 (23)

33 (31)

27 (26)

29 (27)

31 (28)

34 (32)

Function

Forward/reverse select pin. The pin voltage selects forward/reverse.

(Vth = 2.5 V typ at VCC = 5 V)

GND for other than output transistor. Minimum potential of output transistor is at Rf pin.

Input pin when FG amplifier is used with inverted input. Feedback resistor is connected between

this pin and FG-OUT.

Noninverting input pin when FG amplifier is used with differential input. Internal bias is not applied.

FG amplifier output pin. Resistive load provided internally.

Speed control pin. Control is exercised by constant-current drive with current feedback applied from

Rf. Gm = 0.58 A/V typ at Rf=0.5 Ω

Control reference voltage pin. The voltage is set internally to approx. 0.43 x VCC but this can be

varied by applying voltage through a low impedance (input impedance = approx. 4.3 kΩ).

Current limiting function control pin. The output current is varied linearly by this pin voltage; slope

= 0.5 A/V typ at Rf = 0.5 Ω.

Speed control loop frequency characteristic correction pin

U-phase Hall device input pin; logic ‘‘H’’ represent IN+ > IN−.

V-phase Hall device input pin; logic ‘‘H’’ represent IN+ > IN−.

W-phase Hall device input pin; logic ‘‘H’’ represent IN+ > IN−.

Power supply pin for supplying power to all circuits except output section in IC; this voltage must

be stabilized so as to eliminate ripple and noise.

Output section power supply pin

Pin for external adjustment of torque ripple correction factor. When this factor is to be adjusted, a

voltage is externally applied to the ADJ pin through a low impedance. If the voltage applied is

increased, the factor drops; conversely, if it is reduced, the factor rises. The factor varies between

0 and 2 times that of the open state. (The voltage is set to approx. VCC/2 internally, and the input

impedance is approx. 5 kΩ.)

Output current detection pin. Current feedback is applied to the control section by connecting Rf

between this pin and GND. The lower oversaturation prevention circuit and torque ripple correction

circuit are activated in accordance with this pin voltage. Since the oversaturation prevention level

is set with this voltage, the lower oversaturation prevention effect may deteriorate in the high

current range if the Rf value is reduced to an extremely low level. The PWR and SENSE pins must

always be connected.

U-phase output pin

V-phase output pin

W-phase output pin

(Built-in spark killer diode)

GND sensing pin. By connecting this pin to the neighboring GND on the Rf resistor side of the motor

GND wire which contains Rf, the effect that GND common impedance exerts on Rf can be

eliminated. (This pin must not be left open.)

No.5132 - 4/11

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