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NR891D PDF 데이터시트 ( Data , Function )

부품번호 NR891D 기능
기능 Separate Excitation Step-down Switching Mode Regulator IC
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NR891D 데이터시트, 핀배열, 회로
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
NR887D
8 SS
C9
44 ICs





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부품번호상세설명 및 기능제조사
NR891D

Separate Excitation Step-down Switching Mode Regulator IC

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