NIS6201 ON Semiconductor, NIS6201 Datasheet - Page 5

• Manufacturer Part Number: NIS6201
• Description: Floating, Regulated Charge Pump
• Manufacturer: ON Semiconductor

DC Input
volts. An internal shunt diode is included for applications
where the voltage may exceed 15 volts. For voltages
greater than 15 volts an external shunt resistor must be
added in series with the Vcc pin. This resistor must be sized
such that at low line, the voltage drop across it will allow
for an input voltage of greater than that of the output of the
LDO and at high line such that the current into the chip does
not exceed its power rating.
LDO
amplifier with a 0.5 volt reference. A voltage divider is
required from the Vreg pin to the comp pin to set the output
of the LDO. This output voltage (Vreg) is the voltage used
for the charge pump oscillator. The divider can be
calculated from the following formulas:
the bias current in the divider.
The Vcc pin is rated for a maximum dc voltage of 15
The internal LDO contains a P−Channel FET and error
Ibias is generally in the range of 100 mA to 1 mA and sets
R set +
R bias + 0.50
V
R bias (V reg * 0.50 V)
CC
0.50 V
1.25 V
I bias
V
COMP
0.10 V
+
−
Regulator
+
−
Oscillator
OPERATING DESCRIPTION
1 MHz
Figure 7. Overcharge Circuit
Overcharge
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NIS6201
5
V
Overcharge Comparator
function from an overvoltage condition at turn−on.
pump. At turn−on there is a voltage divider consisting of
two capacitors and two diodes. If this device is being
operated at voltages significantly above the Vreg level, it
is possible to charge the Vreg cap well beyond its intended
level.
REG
The overcharge comparator provides a protection
Figure 7 shows a typical configuration for this charge
GND
Figure 6. Bias Voltage Divider
8
DRIVE
3
NIS6201
4
Vset
Vbias
6
0.1uF