Details, datasheet, quote on part number: CS453
PartCS453
Category
Description2.4a/4.4a Injector Solenoid Driver
CompanyCherry Semiconductor (acquired by ON Semiconductor)
DatasheetDownload CS453 datasheet
Quote
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Features, Applications

Description

The is a monolithic integrated circuit designed for medium current solenoid driver applications. Its typical function is to supply full battery voltage to fuel injector(s) for rapid current rise, in order to produce positive injector opening. When load current reaches a preset level (2.4A for or 4.4A for CS453), the injector driver reduces the load current a 4:1 ratio and operates as a constant current source. This condition holds the injector open and reduces system power dissipation. Other solenoid or relay applications can be equally well served by the CS452/453. Two high impedance inputs are provided which permit a variety of control options and can be driven by TTL or CMOS logic.

Features

s Microprocessor Compatible Inputs s On-Chip Power Device 2.4A Peak, Typical CS-452 4.4A Peak, Typical CS453 s Low Thermal Resistance To Grounded Tab s 60V Peak Transient Voltage s Low Saturation Voltage s Operates Over to 24V Battery Range

Absolute Maximum Ratings Power Supply Voltage to 24V Peak Transient Voltage (46V Load Dump)..................................................60V Internal Regulator Current.........................................................................50mA Junction Temperature to +150C Operating Temperature Range (Tab to +125C Storage Temperature to +150C Lead Temperature Soldering Wave Solder (through hole styles only)...10 sec. max, 260C peak

Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: info@cherry-semi.com Web Site: www.cherry-semi.com

Electrical Characteristics: VBAT= 12 VDC, = 25C, test circuit of Test Circuit diagram, unless noted

Output Peak Current (Ipk) Output Sustaining Current (Isus) V(BR)CEO(sus) @ 1mA Output Voltage in Saturated Mode @ 3.0A Internal Regulated Voltage Input on Threshold Voltage Input off Threshold Voltage Input on Current @ VIN 1.4VDC @ VIN = 5.0VDC CONTROL on Threshold Voltage CONTROL Current CONTROL = 0.8VDC CONTROL = 5.0VDC Input Turn On Delay (tl) Ipk sense to Isus delay (tp) CONTROL Signal Delay (tt)

Input Turn Off from Saturated Mode Delay (ts) Input Turn Off from Sustain Mode Delay (td) Output Voltage Rise Time (tv) Output Current Fall Time (tf) 4.0A Package Lead Description

Switches the injector driver on and off. Acts to disable OUT when high. Ground connection. Output Drive current. Supply voltage to IC. VCC is connected to VBAT through a series resistor (300 typ.) Test Circuit

Circuit Description Inductive actuators such as automotive electronic fuel injectors, relays, solenoids and hammer drivers can be powered more efficiently by providing a high current drive until actuation (pull-in) occurs and then decreasing the drive current to a level which will sustain actuation. Pull-in and especially dropout times of the actuators are also improved. The fundamental output characteristic of the CS452/453 provides a low impedance saturated power switch until the load current reaches a predetermined high-current level and then changes to a current source of lower magnitude until the device is turned off. This output characteristic allows the inductive load to control its actuation time during turn-on while minimizing power and stored energy during the sustain period, thereby promoting a fast turnoff time. Automotive injectors at present time come in two types. The large throttle body injectors have an inductance of about 2.0mH and an impedance of 1.2 and require the CS453 driver. The smaller type, popular worldwide, have an inductance of 4.0mH and an impedance of 2.4 and needs about a 2.0A pulse for good results, which can be met with the CS452. Some designs are planned which employ two of the smaller types in parallel. The inductance of the injectors are much larger at low current, decreasing due to armature movement and core saturation to the values above at rated current. Operating frequencies range from to 250Hz depending on the injector location and engine type. Duty cycle in some designs reaches 80%.

Figure 1. Operating Waveforms (Max. Frequency 250Hz, CONTROL Grounded)

 

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