KLN 750W 121912
1-1
SECTION 1 - INTRODUCTION
1.1
SCOPE OF MANUAL
This manual contains instructions for the installation and operation of the KLN series of 750
Watt programmable, voltage and current stabilized d-c power supplies, hereafter referred to as
KLN 750W, from Kepco, Inc., Flushing, New York, U.S.A.
1.2
GENERAL DESCRIPTION
The KLN 750W power supply is a voltage and current stabilized d-c source with a sharp cross-
over between the constant voltage and constant current mode of operation. Eleven models are
offered, with rated d-c output voltage ranging from 6V to 600V and rated d-c output current rang-
ing from 1.25A to 100A (see Table 1-1).
KLN 750W switching power supplies operate from wide range 100-240V a-c, 50/60 Hz input
source power and employ active power factor correction (PFC). Since there are no internal
adjustments, KLN 750W Power Supplies offer excellent output voltage/current stability and easy
calibration.
Output voltage and current are displayed on independent LED displays. Control of the KLN
750W can be either local, via the front panel controls and displays, or remote, using 1) either
analog signals (applied to the Programming Control Port), or 2) digital programming. Digital pro-
gramming of standard models is via RS-485 communication bus. Optional IEEE 488.2 (GPIB)
and LAN interfaces are also available.
KLN 750W output and readback are high resolution: 16 bits D/A to set output voltage and cur-
rent, 24 bits A/D for readback of output voltage and current. These units feature a low tempera-
ture coefficient: Constant Voltage mode: 100ppm/°C, Constant Current mode: 300ppm/°C, and
built-in remote sensing with a maximum compensation of 5V.
The KLN 750W series is suitable for ATE automatic test, burn- in test and other applications that
require lots of testing power.
The KLN 750W power supply acts as a constant voltage source for comparatively large values
of load resistance, and as a constant current source for comparatively small values of load
resistance. The transition between these two modes of operation occurs automatically at a “crit-
ical” or “crossover” value of load resistance
Rc = Es/Is
, where Es is the voltage control setting
and
Is
is the current control setting (see Figure 1-1).
FIGURE 1-1. KLN 750W POWER SUPPLY, AUTOMATIC CROSSOVER CHARACTERISTICS
