LND3842/43/44/45
ELECTRICAL CHARACTERISTICS
(*Vcc =15 V, RT=10kΩ ,CT=3.3nF, TA=0 to 70° C, unless otherwise specified )
Characteristics
Symbol
Test Conditions
Min
Typ
Max
Unit
Reference Section
Reference Output Voltage
Line Regulation
Load Regulation
Short Circuit Output
Current
VREF
∆VREF
∆ VREF
4.9
5.0
6.0
6.0
5.1
20
25
V
TJ =25°C, IREF=1mA
12V≤VCC≤25V
1mA≤ IREF≤20mA
mV
ISC
100
180
mA
TA=25°C
Oscillator Section
Oscillation Frequency
Frequency change with
Voltage
Oscillator Amplitude
Error Amplitude Section
Input Bias Current
Input Voltage
f
47
52
0.05
1.6
57
KHz
%
TJ=25°C
1.0
∆f/∆Vcc
V(OSC)
12V≤VCC≤25V
(Peak to Peak)
V
IBIAS
VI(E,A)
AVOL
VFB=3V
Vpin1=2.5V
2V≤VO≤4V
-0.1
2.5
90
-2
2.58
µA
V
Open Loop Voltage Gain
Power Supply Rejection
ratio
65
60
2
dB
PSRR
ISINK
70
7
12V≤VCC≤25V
Output Sink Current
Vpin2 =2.7V, Vpin1=1.1V
Vpin2=2.3V, Vpin1=5V
mA
mA
Output Source current
High Output Voltage
Low Output Voltage
ISOURCE
-0.5
-1.0
Vpin2=2.3V,RL=15kΩ to
GND
Vpin2=2.7V,RL=15kΩ t o
PIN 8
VOH
VOL
5.0
6.0
0.8
V
1.1
Current Sense Section
Gain
Maximum Input Signal
Supply Voltage rejection
Input Bias Current
Output Section
GV
(Note 1& 2)
2.85
0.9
3.0
1.0
70
3.15
1.1
V/V
V
dB
VI(MAX)
SVR
IBIAS
Vpin1 =5V(note 1)
12V≤Vcc≤25V(note 1)
Vpin3= 3V
-3.0
-10
µA
Isink=20mA
Isink=200mA
Isink=20mA
Isink=200mA
TJ=25°C, CL =1nF(note
3)
0.08
1.4
13.5
13.0
0.4
2.2
Low Output Voltage
High Output Voltage
Rise Time
VOL
VOH
tR
V
13
12
45
35
150
150
nS
nS
TJ=25°C, CL =1nF(note
3)
Fall time
tF
Undervoltage Lockout Section
LND3842A,B/44A,B
LND3842A,B/45A,B
LND3842A,B/44A,B
LND3842A,B/45A,B
14.5
7.8
8.5
7.0
16.0
8.4
10
17.5
9.0
11.5
8.2
Start Threshold
VTH(ST)
V
V
Min. Operating Voltage
(After Turn on)
VOPR(MIN)
7.6
PWM Section
LND3842A,B/43A,B
LND3842A,B/45A,B
95
47
97
48
100
50
0
Max. Duty Cycle
D(MAX)
D(MAX)
%
Min. Duty cycle
Total Standby Current
LND3842A/43A/44A/45A
LND3842B/43B/44B/45B
VPIN3=VPIN2 =0V
0.17
0.45
13
0.3
1
17
Start-Up current
IST
mA
Operating Supply Current
Zener Voltage
ICC(OPR)
VZ
mA
V
ICC=25mA
30
38
*Adjust VCC above the start threshold before setting it to 15V.
• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •
LINEAR_DIMENSIONS [ Linear Dimensions ]
