MAX17075 Evaluation Kit
Evluates:MAX1075
2) Verify that a shunt is installed across jumper JU2
(VGON internally connected to SRC).
The VGOFF supply consists of a negative charge pump
that generates -7V and provides > 60mA. This output can
be adjusted from approximately 0 to -AVDD by replacing
feedback resistors R6 and R7 (refer to the Design
Procedure, Charge-Pump Regulators, Output-Voltage
Selection section in the MAX17075 IC data sheet).
3) Verify that no shunt is installed across jumper JU3
(VGON is not connected to capacitive dummy load
C18).
4) Connect the positive terminal of the power supply
to the VIN pad on the EV kit. Connect the negative
terminal of the power supply to the PGND pad next
to the VIN pad.
The MAX17075 provides a high-current op amp that
sources or sinks 500mA peak current. The op amp out-
put is configured for +6.5V (AVDD/2).
The MAX17075 contains two high-voltage switches that
operate in a complementary fashion. One of the switch-
es provides a connection between the COM (VGON
PCB pad) and SRC pins. The other switch provides a
connection between the COM and DRN pins. The
switches are controlled by an external TTL logic signal
connected to the CTL pad.
5) Turn on the power supply and set the supply to
+4.5V.
6) Verify that the step-up switching regulator output
(AVDD) is +13V.
7) Verify that the gate-on supply (VGON) is +30V.
8) Verify that the gate-off supply (VGOFF) is -7V.
9) Verify that the op-amp output (VCOM) is +6.5V.
When CTL is high, VGON is connected to SRC, charg-
ing VGON to the voltage of the positive charge pump at
the SRC pin. When CTL is low, VGON is connected to
DRN, allowing VGON to discharge toward AVDD
(through resistor R14). The MAX17075 EV kit also fea-
tures a capacitive dummy load of 1500pF (C18) at the
VGON output pad that can be connected through
jumper JU3 to simulate a TFT panel load for testing the
switch array.
Detailed Description of Hardware
The MAX17075 EV kit contains a step-up switching reg-
ulator, a positive charge pump, a negative charge
pump, a high-current op amp, and a high-voltage
switch array. The EV kit is configured to operate from a
DC power supply between +2.5V and +5.5V that pro-
vides at least 5A. The MAX17075 switching frequency
is 1.2MHz.
The high-voltage switch delay time can be configured
by replacing capacitor C8. Refer to the Power-Up
Sequence and Soft-Start section in the MAX17075 IC
data sheet for additional details.
With +5V input voltage, the step-up switching regulator
(AVDD) generates a +13V output and provides at least
500mA. The step-up switching regulator output voltage
can be adjusted up to +18V by replacing feedback
resistors R8 and R9 (refer to the Design Procedure,
Step-Up Regulator, Output-Voltage Selection section in
the MAX17075 IC data sheet). Operation at significantly
higher output voltages could reduce the available out-
put current and require changes in component values
or component voltage rating.
Jumper Selection
Op-Amp Output (VCOM)
Jumper JU1 configures the op-amp output (VCOM) on
the MAX17075 EV kit. The op-amp output (VCOM) of
the MAX17075 EV kit can be buffered with a push-pull
output stage, or unbuffered. See Table 1 for JU1 shunt
positions.
The gate-on (VGON) supply consists of a two-stage
positive charge pump that generates +30V and pro-
vides greater than 30mA. This output can be adjusted
up to approximately +3xAVDD by replacing feedback
resistors R15 and R16 (refer to the Design Procedure,
Charge-Pump Regulators, Output-Voltage Selection
section in the MAX17075 IC data sheet).
Table 1. JU1 Jumper Selection (VCOM)
SHUNT POSITION
VCOM
1-2*
2-3**
None
Buffered
Unbuffered
Not connected
*Install appropriate transistors Q1, Q2, and resistor R2 to buffer
the VCOM output. See the Component List.
**Default position.
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