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PDF UPC1944GR Data sheet ( Hoja de datos )
| Número de pieza | UPC1944GR | |
| Descripción | ADJUSTABLE PRECISION SHUNT REGULATORS | |
| Fabricantes | NEC | |
| Logotipo |  |
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DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUIT
µ PC1943,1944
ADJUSTABLE PRECISION SHUNT REGULATORS
DESCRIPTION
The µ PC1943,1944 are adjustable precision shunt regulators with guaranteed thermal stability. The output voltage can
be set to any value between reference voltage (1.26 V) and 24 V by two external resistors.
These ICs can apply to error amplifier of switching regulators.
FEATURES
• Low voltage operation and High accuracy.
• Adjustable output voltage by two external resistors.
• Pin compatible to µ PC1093.
VREF = 1.26 V ± 2.4 %
VREF ≤ VOUT ≤ 24 V
ORDERING INFORMATION
Part Number
Package
µ PC1943T
µ PC1944T
µ PC1944J
µ PC1944GR
Power mini mold (SOT-89)
Power mini mold (SOT-89)
3-pin plastic SIP (TO-92)
8-pin plastic SOP (5.72 mm (225))
BLOCK DIAGRAM
REF
K
A
PIN CONFIGURATION (Marking Side)
Power mini mold (SOT-89)
µ PC1943T
µ PC1944T
AA
123
REF A K
123
K A REF
3-pin plastic SIP (TO-92)
µ PC1944J
3-pin plastic SOP (5.72 mm (225))
µ PC1944GR
1 23
K1
NC 2
NC 3
NC 4
8 REF
7 NC
6A
5 NC
REF A K
A: Anode
K: Cathode
REF: Reference
NC: No Connection
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. G10239EJ3V0DS00 (3rd edition)
(Previous No. IC-3454)
Date Published March 2000 NS CP (K)
Printed in Japan
The mark shows major revised points.
©
1994, 2000
1 page  
µ PC1943,1944
IREF vs TA
IKoff vs TA
4.0 0.2
VKA = VREF, IK = 10 mA,
VKA = 24 V
R1 = 10 kΩ, R2 = ∞
VREF = 0 V
3.0
2.0 0.1
1.0
0 −20 0 20 40 60 80 100 120
TA - Operating Ambient Temperature - °C
Av, φ vs f
60 +90
Av
40
0
0 −20 0 20 40 60 80 100 120
TA - Operating Ambient Temperature - °C
| ZKA | vs f
50
VKA = VREF
1mA ≤ IK ≤ 30 mA
10
φ
20
220 Ω
0
IK
υo
υin
10 kΩ
10 kΩ
−201k
(IK = 10 mA)
10k 100k 1M
f - Frequency - Hz
−90
−180
10M−270
1.0
0.1
1k
10k 100k 1M
f - Frequency - Hz
10M
2.0
1.8
a: VKA = VREF
b: VKA = 3 V
1.6 c: VKA = 5 V
Stability Area
1.4
1.2 a
1.0 Stable
0.8
c
0.6
0.4
0.2
0
0.001
b
Unstable
0.01 0.1
1
CKA - Lode Capacitance - µ F
Stable
10
Test Circuit
a:
150 Ω
IKA
CKA
b, c:
150 Ω
IKA
R
10 kΩ
CKA
CKA: Monolithic Ceramic Capacitor
Caution of Stability Area
If the Aluminum electrolytic capacitor is used, it should be kept CKA ≥ 6.8 µ F. When using plural different types of
capacitors, each capacitor is needed to be stable independently.
Data Sheet G10239EJ3V0DS00
5
5 Page 
[MEMO]
µ PC1943,1944
Data Sheet G10239EJ3V0DS00
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet UPC1944GR.PDF ] | |
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