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NJM2381 Datasheet(PDF) 4 Page - New Japan Radio

Part # NJM2381
Description  SWITCHING REGULATOR CONTROL IC FOR FLYBACK WITH CURRENT SENSE AMPLIFIER
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Manufacturer  NJRC [New Japan Radio]
Direct Link  http://www.jrc.co.jp/eng/index.html
Logo NJRC - New Japan Radio

NJM2381 Datasheet(HTML) 4 Page - New Japan Radio

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NJM2381
- 4 -
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ELECTRICAL CHARACTERISTICS (V+=6V,RT=33kΩ,CT=1000pF,Ta=25°C)
ERROR AMPLIFIER BLOCK
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
Reference Voltage2
VB2
0.51
0.52
0.53
V
Input Bias Voltage2
IB2
–
5
100
nA
Open Loop Gain2
AV2
–
90
–
dB
Gain Bandwidth Product2
GB2
–
0.6
–
MHz
Maximum Output Voltage2
(F.B Pin)
VOM-2
RNF=100kΩ
–
–
1
V
Maximum Source Current2
(F.B Pin)
IOM+2
VOM=0.5V
40
85
200
µA
PWM COMPARATE BLOCK
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
Input Threshold Voltage
(F.B Pin)
VTH0
duty·cycle=0%
–
1.65
1.75
V
Input Threshold Voltage
(F.B Pin)
VTH50
duty·cycle=50%
–
1.88
–
V
Maximum Duty Cycle
αM
Current Sense Amp.=HIGH
Error Amp.=HIGH ,CS Pin=1.2V
55
64
85
%
SOFT START CIRCUIT BLOCK
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
Input Bias Current
(CS Pin)
IBCS
CS Pin=1.8V
–
250
650
nA
Input Threshold Voltage
(CS Pin)
VTHCS0
duty·cycle=0%
–
0.25
0.35
V
Input Threshold Voltage
(CS Pin)
VTHCS50 duty·cycle=50%
–
0.52
–
V
UNDER VOLTAGE LOCKOUT BLOCK
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
ON Threshold Voltage
VTHON
–
2.70
–
V
OFF Threshold Voltage
VTHOFF
–
2.52
–
V
Hysteresis Voltage
VHYS
60
180
–
mV
OUTPUT BLOCK
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
H-Output Voltage (OUT Pin)
VOH
RL=10kΩ
3.50
4.00
–
V
L-Output Voltage (OUT Pin)
VOL
Output Sink Current=20mA
–
0.25
0.65
V
Output Source Current
(OUT Pin)
ISOURCE OUT Pin=0V
8
11
–
mA
GENERAL CHARACTERISTICS
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
Latch Mode
Threshold Voltage (CS Pin)
VTHLA
1.2
1.5
1.8
V
Quiescent Current
ICCLA
Latch Mode
–
1.6
2.2
mA
Average Quiescent Current
ICCAV
RL=
, duty·cycle=50%
–
3.5
4.8
mA


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