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PDF UPC1934GR-1JG Data sheet ( Hoja de datos )

Número de pieza UPC1934GR-1JG
Descripción DC-DC CONVERTER CONTROL IC
Fabricantes NEC 
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DATA SHEET
BiCMOS INTEGRATED CIRCUIT
µ PC1934
DC-DC CONVERTER CONTROL IC
DESCRIPTION
The µ PC1934 is an IC that controls a low-voltage input DC-DC converter. This IC is suitable for an operation with 3-V,
3.3-V input or a lithium ion secondary battery input, because the minimum operation supply voltage is 2.5 V. Because of
its wide operating voltage range, it can also be used to control DC-DC converters that use an AC adapter for input.
FEATURES
Low supply voltage: 2.5 V (MIN.)
Operating voltage range: 2.5 to 20 V (breakdown voltage: 30 V)
Timer latch circuit for short-circuit protection.
Ceramic capacitor with low capacitance (0.1 µ F) can be used for short-circuit protection.
Open drain outputs (Each of the outputs can be used to control a step-down converter, a step-up converter and an
inverted converter.)
Can control two output channels.
ORDERING INFORMATION
Part Number
Package
µ PC1934GR-1JG 16-pin plastic SSOP (5.72 mm (225))
µ PC1934GR-PJG 16-pin plastic TSSOP (5.72 mm (225))
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. G13567EJ3V0DS00 (3rd edition)
Date Published April 2000 NS CP (K)
Printed in Japan
The mark 5 shows major revised points.
1998

1 page




UPC1934GR-1JG pdf
µ PC1934
1. ELECTRICAL SPECIFICATIONS
Absolute Maximum Ratings (unless otherwise specified, TA = 25 °C)
Parameter
Supply voltage
Output voltage
Output current (open drain output)
Total power dissipation
Operating ambient temperature
Storage temperature
Symbol
VCC
VO
IO
PT
TA
Tstg
µ PC1934GR-1JG
µ PC1934GR-PJG
30
30
21
417 400
–20 to + 85
–55 to + 150
Unit
V
V
mA
mW
°C
°C
Caution Product quality may suffer if the absolute maximum rating is exceeded even momentarily for any
parameter. That is, the absolute maximum ratings are rated values at which the product is on the verge
of suffering physical damage, and therefore the product must be used under conditions that ensure
that the absolute maximum ratings are not exceeded.
Recommended Operating Conditions
Parameter
Supply voltage
Output voltage
Output current
Operating temperature
Oscillation frequency
Symbol
VCC
VO
IO
TA
fOSC
MIN.
2.5
0
20
20
TYP.
MAX.
20
20
20
+85
1000
Unit
V
V
mA
°C
kHz
Caution The recommended operating range may be exceeded without causing any problems provided that the
absolute maximum ratings are not exceeded. However, if the device is operated in a way that exceeds
the recommended operating conditions, the margin between the actual conditions of use and the
absolute maximum ratings is small, and therefore thorough evaluation is necessary. The recommended
operating conditions do not imply that the device can be used with all values at their maximum values.
Data Sheet G13567EJ3V0DS00
5

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UPC1934GR-1JG arduino
µ PC1934
2.3 Under Voltage Lock-out Circuit
The under voltage lock-out circuit prevents malfunctioning of the internal circuits when the supply voltage is low, such as
when the supply voltage is first applied, or when the power supply is interrupted. When the voltage is low, the two output
transistors are cut off at the same time.
2.4 Error Amplifiers
The circuits of the error amplifiers E/A1 and E/A2 are exactly the same. The first stage of the error amplifier is a P-
channel MOS transistor input. Be careful of the input voltage ranges (the common mode input voltage ranges are all 0 to
0.4 V (TYP.)).
2.5 PWM Comparators
The output ON duty is controlled according to the outputs of the error amplifiers and the voltage input to the Dead Time
Control pin.
A triangular waveform is input to the non-inverted pin, and the error amplifier output and Dead Time Control pin voltage
are input to the inverted pins of the PWM comparators. Therefore, the output transistor ON period is the period when the
triangular waveform is higher than the error amplifier output and Dead Time Control pin voltage (refer to Timing Charts).
2.6 Timer Latch-Method Short Circuit Protection Circuit
When the converter outputs either a channel or both channels drop, the FB outputs of the error amplifiers of those
outputs go low. If the FB output goes lower than the timer latch input detection voltage (VTH = 0.63 V)), then the output of
the SCP comparator goes low, and Q1 goes off.
When Q1 turns OFF, the constant-current supply charges CDLY via the DLY pin. The DLY pin is internally connected to a
flip-flop. When the DLY pin voltage reaches the UV detection voltage (VUV = 0.8 V (TYP.)), the output Q of the flip-flop goes
low, and the output stage of each channel is latched to OFF (refer to Figure 2-1 Block Diagram).
Make the power supply voltage briefly less than the reset voltage (VCCR, 1.0 V TYP.) to reset the latch circuit when the
short-circuit protection circuit has operated.
2.7 Output Circuit
The output circuit has an N-channel open-drain output providing an output withstand voltage of 30 V (absolute maximum
rating), and an output current of 21 mA (absolute maximum rating).
Data Sheet G13567EJ3V0DS00
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