- 您现在的位置：买卖IC网 > PDF目录97995 > L497B (STMICROELECTRONICS) SPECIALTY ANALOG CIRCUIT, PDIP16 PDF资料下载
参数资料
| 型号： | L497B |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDIP16 |
| 封装： | DIP-16 |
| 文件页数： | 5/11页 |
| 文件大小： | 474K |
| 代理商： | L497B |
Obsolete
Product(s)
- Obsolete
Product(s)
PIN FUNCTIONS (refer to fig. 4)
N
°
Name
Function
1
GND
This pin must be connected to ground.
2
SIGNAL GND
This pin must be connected to ground.
3
POWER SUPPLY
Supply Voltage Input. An internal 7.5 V (typ) zener zener limits the voltage
at this pin. The external resistor R5 limits the current through the zener for
high supply voltages.
4
N.C.
This pin must be connected to ground or left open.
5
HALL-EFFECT INPUT
Hall-effect Pickup Signal Input. This input is dwell control circuit output in
order to enable the current driving into the coil. The spark occurs at the
high-to-low transition of the hall-effect pickup signal.
Furthermore this input signal enables the slow recovery and permanent
conduction protection circuits. The input signal, supplied by the open
collector output stage of the Hall effect sensor, has a duty-cycle typically
about 70 %. V5 is internally clamped to V3 and ground by diodes
6
RPM OUTPUT
Open collector output which is at a low level when current flows in the
ignition coil. For high voltages protection of this output, connection to the
pin 7 zener is recommended.
In this situation R8 must limit the zener current, too, and R1 limits pin 6
current if RPM module pad is accidentally connected to VS.
7
AUX. ZENER
A 21 V (typ) General Purpose Zener. Its current must be limited by an
external resistor.
8
RECOVERY TIME
A capacitor connected between this pin and ground sets the slope of the
dwell time variation as it rises from zero to the correct value. This occurs
after the detection of Icoll
≤ 94 % Inom, just before the low transition of the
hall-effect signal pulse.
The duration of the slow recovery is given by :
tsrc = 12,9 R7 Csrc (ms)
where R7 is the biasing resistor at pin 12 (in K
) and Csrc is the delay
capacitor at pin 8 (in
F).
9
MAX CONDUCTION
TIME
A capacitor connected between this pin and ground determines the
intervention delay of the permanent conduction protection. After this delay
time the coil current is slowly reduced to zero.
Delay Time Tp is given by :
Tp =16 Cp R7 (ms)
where R7 is the biasing resistor at pin 12 (in K
) and CP is the delay
capacitor at pin 9 (in
F).
10
DWELL CONTROL
TIMER
A capacitor CT connected between this pin and ground is charged when the
HAll effect output is High and is discharged at the High to Low transition of
the Hall effect signal.
The recommended value is 100 nF using a 62 K
resistor at pin 12.
11
DWELL CONTROL
The average voltage on the capacitor CW connected between this pin and
ground depends on the motor speed and the voltage supply. The
comparison between VCW and VCT voltage determines the timing for the
dwell control. For the optimized operation of the device CT = CW; the
recommended value is 100 nF using a 62 K
resistor at pin 12.
12
BIAS CURRENT
A resistor connected between this pin and ground sets the internal current
used to drive the external capacitors of the dwell control
(pin 10 and 11) permanent conduction protection (pin 9) and slow recovery
time (pin 8). The recommended value is 62 K
.
13
CURRENT SENSING
Connection for the Coil Current Limitation. The current is measured on the
sensing resitor RS and taken through the divider R10/R11. The current
limitation value is given by :
Isens
= 0.32
R10
+ R11
RS
R11
L497
3/11
相关PDF资料 |
PDF描述 |
|---|---|
| L4981BD013TR | 2 A POWER FACTOR CONTROLLER, 115 kHz SWITCHING FREQ-MAX, PDSO20 |
| L4985D | 1.5 A SWITCHING REGULATOR, 83 kHz SWITCHING FREQ-MAX, PDSO20 |
| L4992 | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PQFP32 |
| L5953 | 1.2 A SWITCHING REGULATOR, 425 kHz SWITCHING FREQ-MAX, PDSO36 |
| L5962 | SWITCHING REGULATOR, PDSO36 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| L497D1 | 功能描述:马达/运动/点火控制器和驱动器 Hall Effect Control RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| L4981 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:L4981 功率因数校正集成电路 |
| L4981A | 功能描述:功率因数校正 IC Very High Power RoHS:否 制造商:Fairchild Semiconductor 开关频率:300 KHz 最大功率耗散: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel |
| L4981A | 制造商:STMicroelectronics 功能描述:POWER FACTOR CORRECTOR 4981 DIP20 |
| L4981A_01 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:POWER FACTOR CORRECTOR |
发布紧急采购，3分钟左右您将得到回复。