NR887D PDF даташит
Спецификация NR887D изготовлена «ETC» и имеет функцию, называемую «Separate Excitation Step-down Switching Mode Regulator IC». |
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Детали детали
Номер произв | NR887D |
Описание | Separate Excitation Step-down Switching Mode Regulator IC |
Производители | ETC |
логотип |
2 Pages
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1-1-3 DC/DC Converter ICs
NR887D/NR891D Full-Mold, Separate Excitation Step-down Switching Mode Regulator ICs
■Features
Current Mode Control, Synchronous Rectifier Step-down Switching Mode
■Absolute Maximum Ratings
• DIP 8 pin package
• Input voltage range (VIN): VO + 3 to 18 V
• Synchronous rectifier mode
• High efficiency: 90%
• Introduction of current mode control method
• A ceramic capacitor can be used for output
• Built-in phase correction component
• Output current: 2 A
• Reference voltage and accuracy of 0.8 V ± 2%
• Oscillation frequency: 500 kHz
• Output ON/OFF available
• Undervoltage lockout
• Soft start function
■Applications
Parameter
Input Voltage
Power Dissipation
Junction Temperature
Storage Temperature
Thermal Resistance (Junction to Lead (4 pins))
Thermal Resistance (Junction to Ambient Air)
Symbol
VIN
PD
Tj
Tstg
θj-c
θj-a
Ratings
20
1.50
–40 to +150
–40 to +150
25
67
Unit
V
W
°C
°C
°C/W
°C/W
Conditions
When mounted on a 70 × 60 mm glass-epoxy board (with a 1310 mm2 copper area)
When mounted on a 70 × 60 mm glass-epoxy board (with a 1310 mm2 copper area)
■Recommended Operating Conditions
Parameter
Input Voltage Range
Output Current Range
Output Voltage Range
Operating Temperature Range
Ratings
4.5 or VO + 3* to 18
0 2.0
0.8 to 14
–40 to +85
*: The minimum value of the input voltage range is 4.5 V or VO + 3 V, whichever is higher.
Unit
V
A
V
°C
• Power supply for LCDTV and PDP
• Power supply for DVD, BD, and STB
• On-board local power supply
• Power supply for switches
■Electrical Characteristics
Reference Voltage
Temperature Coefficient of Reference Voltage
Efficiency
Oscillation Frequency
Line Regulation
Load Regulation
Overcurrent Protection Starting Current
Quiescent Circuit Current 1
Quiescent Circuit Current 2
SS Pin
Outflow Current at Low Voltage
Open Voltage
EN Pin
Inflow Current
On Threshold Voltage
Maximum ON Duty
Minimum ON Time
Thermal Protection Start Temperature
Thermal Protection Return Hysteresis
η
min.
0.784
400
3.1
6
0.7
151
Ratings
typ.
0.800
±0.05
90
500
50
50
6
10
3.0
50
1.4
90
150
165
20
max.
0.816
600
6.0
10
14
100
2.1
*: Pin 8 is the SS pin. Soft start at power on can be performed with a capacitor connected to this pin.
The SS pin is pulled up to the power supply in the IC, so applying the external voltage is prohibited.
(Ta=25°C, VIN=12V, VO=3.3V, and Io=1.0A, unless otherwise specified)
Unit
V
mV/
%
kHz
mV
mV
A
mA
µA
µA
V
µA
V
%
nsec
–
Ω
NR887D
8 SS
C9
44 ICs
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■External Dimensions (DIP8)
87
65
12
34
9.4±0.3
1.0+-00..305
1.5+-00..305
7.6
0.25-+00..015
2.54
0.89 TYP
0.5±0.1
0.25 M
0° to 15°
■Block Diagram
2
IN
7
ON/
EN OFF
OSC
Σ
3.5V
P.REG
VREF
0.8V
TSD
+
-
Current
Sense
OCP
Drive
REG
5V
PWM
LOGIC
5V
6 NC
UVLO
GND
4
3.5V
10uA
Compensation
-++
Error Amp
0.8V
SS
8
SS
BS
1
SW
3
FB 5
■Typical Connection Diagram
VIN
C2
R3
2
7 VIN
EN
C10
1
BS 3
SW
L1
C1 NR887D
8
SS
5
FB
GND
NC
46
C9
R4
R5
R6
D1
Vout
C4 C5
NR887D
(Unit : mm)
Pin Assignment
q BS
w VIN
e SW
r GND
t FB
y NC
u EN
i SS
Plastic Mold Package Type
Flammability: UL 94V-0
Product Mass: Approx. 0.49g
C1, C2: 10µF/25V
C4, C5: 22µF/16V
C9: 0.1µF
C10: 0.1µF
L1: 10µH
R3: 20 to 47
R4+R5: 5k
(VO=3.3V)
R6: 1.6k
ICs 45
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Номер в каталоге | Описание | Производители |
NR887D | Separate Excitation Step-down Switching Mode Regulator IC | ETC |
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DataSheet26.com | 2020 | Контакты | Поиск |