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NR891D Datasheet Download - ETC

Номер произв NR891D
Описание Separate Excitation Step-down Switching Mode Regulator IC
Производители ETC
логотип ETC логотип 



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NR891D Даташит, Описание, Даташиты
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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NR891D Даташит, Описание, Даташиты
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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