SP6660EB Datasheet, PDF (2/6 Pages) Sipex Corporation – Evaluation Board Manual

BOARD LAYOUT
The SP6660 Evaluation Board has been
designed to conveniently provide access to all
Inputs and Outputs of the SP6660 device under
test. Position the board with the silkscreen letter-
ing upright (also see the drawing on the front
page of this manual) and you will see two circuits
– the Doubler Circuit on top, and the Inverter
Circuit below. Also, note the Doubler Circuit is
followed by an LDO Circuit, producing a 5V
regulated output from a 3V input to the Doubler.
The Input and Output connections are made with
raised female pin receptacles which can
accommodate easy-hook connection leads for
power and meter connections, as well as scope
probe hooks and grounds for waveform
measurements.
USING THE EVALUATION BOARD
Connect the SP6660 Evaluation Board
Doubler Circuit or Inverter Circuit to a positive
power supply for V_IN. It is good practice to not
switch power on until power connections are
made to the evaluation board.
Evaluating Doubler Circuit
V_IN — U1-3 — Connect to external supply V_IN
= +2.5 to +4.25V.
GND — U1-5 — Connect to external
supply GND.
CAP+ — U1-2 — Use to monitor Charge Pump
Frequency (1/2 OSC pin frequency).
V — U1-8 — Connect to Load, Meter or
OUT
Scope. V = +5.0 to +8.5V.
OUT
GND — U1-5 — Connect to Load, Meter or
Scope GND.
FC — U1-1 — Connect to OPEN for Low
Frequency, to V_OUT for High Frequency.
Evaluating Doubler Circuit
with 5V LDO Regulator
Same connections as Doubler above, but with
additional LDO outputs:
+5 — U2-5 — Connect to Load, Meter or
Scope. VOUT = +5.0V.
GND — U2-2 — Connect to Load, Meter or
Scope GND.
Evaluating Inverter Circuit
V — U3-8 — Connect to external supply V
IN
IN
= +1.5 to +4.25V.
GND — U3-3 — Connect to external
supply GND.
CAP+ — U3-2 — Use to monitor Charge Pump
Frequency (1/2 OSC pin frequency).
V_OUT — U3-5 — Connect to Load, Meter or
Scope. V_OUT = -1.5 to -4.25V.
GND — U3-3 — Connect to Load, Meter or
Scope GND.
FC — U3-1 — Connect to OPEN for Low
Frequency, to V_OUT for High Frequency.
Evaluating Oscillator Performance
with Inverter or Doubler Circuit
To accurately measure the internal oscillator
frequency at pin 7 is extremely difficult;
any connection to this pin may induce
capacitance which will change the frequency
(1/RoscCosc). For this reason the SP6660
Evaluation Board has only a small pad
connection to it and not a pin receptacle.
Alternatively, you can measure the charge pump
frequency at the CAP+ pin, which equals 1/2 the
OSC pin frequency.
To run the Inverter or Doubler Circuit at other
frequencies, the OSC pin can be driven with an
external oscillator with a square wave of 0 to V_IN
volts. Tests have shown that the circuits can
typically perform up to oscillator frequencies of
800kHz.
SP6660EB/06
SP6660 Evaluation Board Manual
2
© Copyright 2000 Sipex Corporation