Datasheet.kr   

L6246 데이터시트 PDF




STMicroelectronics에서 제조한 전자 부품 L6246은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 L6246 자료 제공

부품번호 L6246 기능
기능 12V VOICE COIL MOTOR DRIVER
제조업체 STMicroelectronics
로고 STMicroelectronics 로고


L6246 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




전체 12 페이지수

미리보기를 사용할 수 없습니다

L6246 데이터시트, 핀배열, 회로
L6246
12V VOICE COIL MOTOR DRIVER
12V (±10%) OPERATION
3A MAXIMUM CURRENT CAPABILITY
0.3MAXIMUM ON RESISTANCE OF EACH
POWER DMOS AT A JUNCTION TEM-
PERATAURE OF 25°C
CLASS AB POWER AMPLIFIERS
LOGIC AND POWER SUPPLY MONITOR
POWER ON RESET
PARKING FUNCTION WITH SELECTABLE
RETRACT VOLTAGE AND DYNAMIC BRAKE
BEFORE PARKING
ENABLE FUNCTION
GATE DRIVER FOR EXTERNAL BLOCKING
N-MOSFET
OVERTEMPERATURE PROTECTION
OVERTEMPERATURE WARNING OUTPUT
PQFP44 PACKAGE
MULTIPOWER BCD TECHNOLOGY
PQFP44 (10x10)
DESCRIPTION
The voice coil driver L6246 is a linear power am-
plifier designed to drive single phase bipolar DC
motors for hard disk drive applications. The de-
vice contains a selectable transconductance loop,
which allows high precision for head positioning.
The power stage is composed of 2 power amplifi-
ers, in AB class, with 4 DMOSs, with Rdson of
0.5(Sink+Source) maximum, in a H-bridge con-
figuration. Drive voltage for the upper DMOS
FETs is provided by a charge pump circuit to en-
sure low Rdson.
Automatic brake and parking of the head actuator
is performed by logic or when a failure condition
is detected by power supply monitors. An external
resistor programs the parking voltage that en-
ables the head retract. In addition, a 5V stable
output is provided for the external usage, and a
gate driver circuit enables an external power sup-
ply isolation N-MOSFET.
This device is built in BCD II technology allowing
dense digital circuitry to be combined with high
power bipolar power devices and is assembled in
PQFP44.
February 1998
1/12




L6246 pdf, 반도체, 판매, 대치품
L6246
PIN FUNCTIONS (continued)
Pin Name
Description
26
+12Setpt
+12V Monitor Set Point and filtering
27
Vbemf
Input BEMF from spindle motor for parking circuit.
28
Rpark
Resistor for setting the park voltage.
29
-W_Gate
Write Gate Input.
30 +VCM park External input for parking. High will activate the park procedure.
31 -Spindle_start Spindle Start input.
32
+Enable
Input. logic low will disable only the IC.
33
N.C.
Not Connected.
34
Cpgnd
Charge Pump Ground.
35 Gnd Ground.
36
Out+
Power Amplifier Output.
37 Vcc +12V Power Supply.
38 C1 Charge Pump Oscillator Output.
39 C2 Input for external Charge Pump Capacitor.
40 Vcp Output for Charge Pump Storage Capacitor.
41 Vcc +12V Power Supply.
42 Out- Power Amplifier Output.
43 Gnd Ground.
44 Gate Drive Gate Drive for External Isolation N-MOSFETS.
ELECTRICAL CHARACTERISTICS (Tj = 25°C, Vdd = 5V, Vcc = 12V; unless otherwise specified.)
Symbol
Parameter
Test Condition
Vcc Analog/Power supply voltage
range
Vdd Digital supply voltage range
Idd Digital supply quiescent current Output ENABLED
Idd Digital supply quiescent current Output DISABLED
Icc Power supply quiescent current Output ENABLED
Icc Power supply quiescent current Output DISABLED
THERMAL SHUT DOWN DATA
Th_SD
Shut down Temperature
Th _SD_H
Th_Warn
Shut down hysteresys
Pre Shut down alarm
Pre Shut down alarm hysteresys
EXTERNAL N-MOSFET GATE DRIVER
Vll Low level voltage
Vhl High level voltage
Isink
Current sinking capability
Isource Current source capability
POWER ON RESET AND GATE SPECIFICATION
Vdd_und_th Digital undervoltage threshold
Vcc_und_th
POR_to
POR_delay
Vdd_POR_T_R
Power undervoltage threshold
POR timeout
Time delay for POR Active
Power supply POR thereshold
Resistance
Cpor = 1µF
Min.
10.8
Typ.
12
Max.
13.2
Unit
V
4.5 5 5.5 V
5 mA
5 mA
20 mA
10 mA
135 160
25
115 140
15
°C
°C
°C
°C
500 mV
Vcc+4
V
4 mA
0.5 mA
3.8 4.1 4.45 V
8.5 9.25 10.0
V
375 500 625 ms
1 µs
10 K
4/12

4페이지










L6246 전자부품, 판매, 대치품
L6246
POWER SUPPLY MONITOR
This circuit monitors the logic supply (5V) and the
power supply (12V) and activates the power on
reset output (POR) and the VCM PARK circuit.
After both logic and power supply reach their
nominal value a timing capacitor (T_CAP) has to
be charge before the POR output change from
low to high level.
where:
POR
d el ay =
C
I
V
C is the capacitor value connected at pin
T_CAP
V is delta voltage that capacitor have to be
charged (2.3V)
I is the costant current charging the capacitor
(4µA typ.)
At the two input pins, +12 FILTER CAP and + 5
FILTER CAP, can be connected two capacitors
for filtering the noise on the power supply, avoid-
ing in this case undesired commutations of the
POR signal because of some fast negative spikes
on the line.
BRAKE AND PARKING CIRCUITS
The voice coil driver is switched into the parking
condition through the VCM PARK input or when
the POR signal is low. In such condition immedi-
ately the output stage turns on the two lower
DMOS of the power bridge to activate the BRAKE
of the voice coil motor.
After a delay generated by the capacitor at the
BRAKE DELAY pin, only one of the two lower
DMOS stays on while the opposite half bridge is
tristated.
where:
BRAKE
delay =
C
I
V
C is the capacitor value connected at pin
BRAKE DELAY
V is delta voltage that capacitor have to be
charged (3V)
I is the costant current charging the capacitor
(5µA typ.)
The parking voltage is then supplied by the
PARKING circuit connected to the output that has
been tristated.
The value of such a voltage is set by connecting
an external resistor between the RPARK pin and
ground.
Vr
=
Vbandgap
Rpark
104
where:
Vr is the retract voltage for parking the heads
Vbandgap is the internal bandgap reference
voltage of 1.4V
Rpark is value of the resistor connected at
RPARK pin
The parking circuit takes the power supply from
the spindle driver through the VBEMF pin, so that
in case of power fail the retract of the heads is
possible using the rectified BEMF voltage coming
from the spindle motor.
CHARGE PUMP
The charge pump circuit is used as a means of al-
most doubling the power supply voltage (12V) in
order to drive the upper DMOS of the power
bridge.
The energy stored in the in the capacitor con-
nected at VCP pin is also used to drive the gate
of the external N-MOSFET.
GATE DRIVER
This circuit provide the voltage driving the gate of
the external isolation N-MOSFET, and it is con-
trolled by the POR signal.
THERMAL
The thermal protection circuit has two threshold,
the first if the pre shut down alarm that activates
the THERMAL SD signal and the second is the
shut down temperature that tristates the output
stage when the junction temperature increases
over this level.
APPLICATION INFORMATION
Example of calculation of the error amplifier com-
pansation for the stability of the current control
loop. As can be seen from the draw of the current
control loop circuit of the next page, the voltage
across the load is:
#1
VL = ACPW ACERR (ACINP VIN - ACENSE Vsense)
Vsense = Rs IL
VL = ( ZL + Rs)IL
where AC... is the closed loop gain of Power, Er-
ror, Sense and Input Amplifier.
Changing in the #1 the transfer function between
the load current and the VIN is:
#2
IL
VIN
=
ZL
+
RS
ACPW
+ ACPW
ACERR
ACERR
ACINP
ACSENSE
RS
7/12

7페이지


구       성 총 12 페이지수
다운로드[ L6246.PDF 데이터시트 ]

당사 플랫폼은 키워드, 제품 이름 또는 부품 번호를 사용하여 검색할 수 있는

포괄적인 데이터시트를 제공합니다.


구매 문의
일반 IC 문의 : 샘플 및 소량 구매
-----------------------------------------------------------------------

IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한
광범위한 전력 반도체를 판매합니다.

전력 반도체 전문업체

상호 : 아이지 인터내셔날

사이트 방문 :     [ 홈페이지 ]     [ 블로그 1 ]     [ 블로그 2 ]



관련 데이터시트

부품번호상세설명 및 기능제조사
L6242

VOICE COIL MOTOR DRIVER

STMicroelectronics
STMicroelectronics
L6243

VOICE COIL MOTOR DRIVER

STMicroelectronics
STMicroelectronics

DataSheet.kr       |      2020   |     연락처      |     링크모음      |      검색     |      사이트맵