L584 datasheet(3/13 Pages) STMICROELECTRONICS

3 / 13 page

PIN FUNCTIONS

Name

Functions

Dump Protection

With pin 1 connected to pin 14 the device is protected against dump voltage

≤ 60V.

The protectio.n operates at VS

≥ 32V (typ.). If this protection is not used the pin must

be left open

Holding Current Control

The voltage Vset applied to this pin sets the holding current level.

Sensing

Connection for load current sense resistor. Vazlue sets the peak and holding current

levels. IP = 0.45/RS (typ.); Ih =Vset/Rs. (see block diagram and fig. 4).

Ground

Ground Connection. With pins 5, 12 and 13 conducts heat to pc board copper.

Ground

See pin 4.

Peak Current Timer

A capacitor connected between this pin and ground sets the duration of the high level

current (t2 in fig. 4)

Discharge Time Constant A capacitor connected between this pin and ground sets the duration of toff (fig. 4). If

grounded, the current switchmode control is suppressed.

PNP Driving Output

Current sink for external PNP darlington (for recirculation). Idp = 35 Ir (typ).

Reference Voltage

A resistor connected between this pin and ground sets the internal current reference,

Ir. The recommended value is 1.2k

Ω giving Ir = 1mA (typ.).

Input

TTL-compatible Input. A high level on this pin activates the output, driving the load.

Inhibit

TTL-compatible Inhibit Input. A high level on this input disables the output stages and

logic circutry, irrespective of the state of pin 10.

12, 13

Ground

See Pin 4.

Supply Voltage

Supply Voltage Input.

NPN Driving Output

Current Source for External NPN Darlington (load driver).Idn = 100 Ir (typ.)

Internal Clamping

Internal Clamp Zener for Fast Turn-off.

000

L584

3/13

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