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
16-pin plastic SSOP (5.72 mm (225))
16-pin plastic TSSOP (5.72 mm (225))
µ
PC1934GR-1JG
µ
PC1934GR-PJG
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
µ
PC1934
BLOCK DIAGRAM
Channel 2
V
REF
16
DLY
15
I
N2
14
I
I2
13
FB
2
12
DTC
2
11
MOS output
Reference
voltage
section
Timer latch for
short-circuit
protection section
MOS input
–
+
E/A
2
–
–
+
PWM
2
OUT
2
10
V
CC
9
MOS output
+
Oscillation
section
–
E/A
1
+
–
–
PWM
1
MOS input
1
C
T
2
R
T
3
I
N1
4
I
I1
5
FB
1
6
DTC
1
7
OUT
1
8
GND
Channel 1
2
Data Sheet G13567EJ3V0DS00
µ
PC1934
PIN CONFIGURATION (Top View)
16-pin plastic SSOP (5.72 mm (225))
•
µ
PC1934GR-1JG
16-pin plastic TSSOP (5.72 mm (225))
•
µ
PC1934GR-PJG
C
T
R
T
I
N1
I
I1
FB
1
DTC
1
OUT
1
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
REF
DLY
I
N2
I
I2
FB
2
DTC
2
OUT
2
V
CC
PIN FUNCTIONS
Pin No.
1
2
3
Symbol
C
T
R
T
I
N1
Function
Frequency setting capacitor connection
Frequency setting resistor connection
Channel 1 error amplifier non-inverted
input
4
5
6
I
I1
FB
1
DTC
1
Channel 1 error amplifier inverted input
Channel 1 error amplifier output
Channel 1 dead time setting
12
13
14
FB
2
I
I2
I
N2
Channel 2 error amplifier output
Channel 2 error amplifier inverted input
Channel 2 error amplifier non-inverted
input
7
OUT
1
Channel 1 open drain output
15
DLY
Delay capacitor connection of short-
circuit protection
8
GND
Ground
16
V
REF
Reference voltage output
Pin No.
9
10
11
Symbol
V
CC
OUT
2
DTC
2
Power supply
Channel 2 open drain output
Channel 2 dead time setting
Function
Data Sheet G13567EJ3V0DS00
3
µ
PC1934
CONTENTS
1. ELECTRICAL SPECIFICATIONS ................................................................................................................ 5
2. CONFIGURATION AND OPERATION OF EACH BLOCK.................................................................... 10
2.1 Reference Voltage Generator ...........................................................................................................................10
2.2 Oscillator ...........................................................................................................................................................10
2.3 Under Voltage Lock-out Circuit ........................................................................................................................11
2.4 Error Amplifiers.................................................................................................................................................11
2.5 PWM Comparators............................................................................................................................................11
2.6 Timer Latch-Method Short Circuit Protection Circuit ....................................................................................11
2.7 Output Circuit....................................................................................................................................................11
3. NOTES ON USE........................................................................................................................................ 12
3.1 Setting the Output Voltage ...............................................................................................................................12
3.2 Setting the Oscillation Frequency ...................................................................................................................13
3.3 Preventing Malfunction of the Timer Latch-Method Short Circuit Protection Circuit..................................13
3.4 Connecting Unused Error Amplifiers ..............................................................................................................13
3.5 ON/OFF Control.................................................................................................................................................14
3.6 Notes on Actual Pattern Wiring........................................................................................................................14
4. APPLICATION EXAMPLE ......................................................................................................................... 15
4.1 Application Example.........................................................................................................................................15
4.2 List of External Parts ........................................................................................................................................15
5. PACKAGE DRAWINGS.............................................................................................................................. 16
6. RECOMMENDED SOLDERING CONDITIONS ....................................................................................... 18
4
Data Sheet G13567EJ3V0DS00
µ
PC1934
1.
ELECTRICAL SPECIFICATIONS
Absolute Maximum Ratings (unless otherwise specified, T
A
=
25
°
C)
Parameter
Supply voltage
Output voltage
Output current (open drain output)
Total power dissipation
Operating ambient temperature
Storage temperature
Symbol
V
CC
V
O
I
O
P
T
T
A
T
stg
417
–20 to + 85
–55 to + 150
µ
PC1934GR-1JG
30
30
21
µ
PC1934GR-PJG
Unit
V
V
mA
400
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
V
CC
V
O
I
O
T
A
f
OSC
−20
20
MIN.
2.5
0
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
能源基础设施
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
