L584
PIN FUNCTIONS
No
1
2
3
4
5
6
7
8
9
10
11
12, 13
14
15
16
000
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 1.2kΩ 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.
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.
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