HV860
2.0
PIN DESCRIPTION
The details on the pins of HV860 are listed in Table 2-1.
Refer to Package Type for the location of pins.
TABLE 2-1:
Pin Number
PIN FUNCTION TABLE
Pin Name
Description
External resistor from REL-Osc to VDD sets the EL frequency. The EL frequency is
inversely proportional to the external REL resistor value. Reducing the resistor
value by a factor of two determines an increase in the EL frequency by two.
1
REL-Osc
Input voltage to set VCS regulation voltage. This pin allows an external voltage
source to control the VCS amplitude. EL lamp dimming can be accomplished by
varying the input voltage at VREG. The VCS voltage is approximately 87 times the
voltage seen on VREG. The external resistor RREG, connected between VREG and
2
VREG
VREF pins, controls the VCS charging rate. The charging rate is inversely propor-
tional to the RREG resistor value.
3
4
VREF
GND
Switched internal reference voltage
Device ground
Drain of internal switching MOSFET. Connection for an external inductor.
The inductor LX is used to boost the low-input voltage by inductive flyback. When
the internal switch is on, the inductor is being charged. When the internal switch is
off, the charge stored in the inductor will be transferred to the high-voltage capaci-
tor, CS. The energy stored in the capacitor is transferred to the internal H-bridge,
and therefore to the EL lamp. In general, smaller value inductors, which can handle
more current, are more suitable to drive larger size lamps. As the inductor value
decreases, the switching frequency of the inductor (controlled by RSW) should be
increased to avoid saturation. A 220 µH inductor with 5.5Ω series DC resistance is
typically recommended. For inductors with the same inductance value, but with
lower series DC resistance, lower RSW resistor value is needed to prevent high
current draw and inductor saturation.
5
LX
6
7
NC
CS
No internal connections to the device
High voltage-regulated output. Connection for an external high-voltage capacitor to
ground.
VB side of the EL lamp driver H-bridge. Connection for one of the EL lamp
terminals.
8
VB
VA side of the EL lamp driver H-bridge. Connection for one of the EL lamp
terminals.
9
VA
VDD
EN
10
11
Low-voltage input supply pin
Logic input pin. Logic high will enable the device. This pin has an 100 kΩ internal
pull-down resistor to GND.
External resistor from RSW-Osc to VDD sets the switch converter frequency.
The switch converter frequency is inversely proportional to the external RSW resis-
tor value. Reducing the resistor value by a factor of two will result in increasing the
switch converter frequency by two.
12
RSW-Osc
DS20005906A-page 6
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