Datasheet

LM2524D, LM3524D
SNVS766E –JUNE 2009–REVISED MAY 2013 www.ti.com
Electrical Characteristics
(1)
(continued)
Symbol Parameter Conditions LM2524D LM3524D
Units
Typ Tested Design Typ Tested Design
Limit
(2)
Limit
(3)
Limit
(2)
Limit
(3)
Δf
OSC
Freq. Change with V
IN
V
IN
= 8 to 40V 0.5 1 0.5 1.0 %
Max
Δf
OSC
Freq. Change with Temp. T
A
= −55°C to +125°C 5 5 %
at 20 kHz R
T
= 5.6k,
C
T
= 0.01 μF
V
OSC
Output Amplitude (Pin 3) R
T
= 5.6k, C
T
= 0.01 μF
3 2.4 3 2.4 V
Min
(5)
t
PW
Output Pulse Width (Pin 3) R
T
= 5.6k, C
T
= 0.01 μF 0.5 1.5 0.5 1.5 μs
Max
Sawtooth Peak Voltage R
T
= 5.6k, C
T
= 0.01 μF 3.4 3.6 3.8 3.8 V
Max
Sawtooth Valley Voltage R
T
= 5.6k, C
T
= 0.01 μF 1.1 0.8 0.6 0.6 V
Min
ERROR-AMP SECTION
V
IO
Input Offset Voltage V
CM
= 2.5V 2 8 10 2 10 mV
Max
I
IB
Input Bias Current V
CM
= 2.5V 1 8 10 1 10 μA
Max
I
IO
Input Offset Current V
CM
= 2.5V 0.5 1.0 1 0.5 1 μA
Max
I
COSI
Compensation Current V
IN(I)
− V
IN(NI)
= 150 mV 65 65 μA
Min
(Sink)
95 95
125 125 μA
Max
I
COSO
Compensation Current V
IN(NI)
− V
IN(I)
= 150 mV −125 −125 μA
Min
(Source)
−95 −95
−65 −65 μA
Max
A
VOL
Open Loop Gain R
L
= ∞, V
CM
= 2.5 V 80 74 60 80 70 60 dB
Min
VCMR Common Mode Input 1.5 1.4 1.5 V
Min
Voltage Range
5.5 5.4 5.5 V
Max
CMRR Common Mode Rejection
90 80 90 80 dB
Min
Ratio
G
BW
Unity Gain Bandwidth A
VOL
= 0 dB, V
CM
= 2.5V 3 2 MHz
V
O
Output Voltage Swing R
L
= ∞ 0.5 0.5 V
Min
5.5 5.5 V
Max
PSRR Power Supply Rejection V
IN
= 8 to 40V
80 70 80 65 db
Min
Ratio
COMPARATOR SECTION
Minimum Duty Cycle Pin 9 = 0.8V,
t
ON
/t
OSC
0 0 0 0 %
Max
[R
T
= 5.6k, C
T
= 0.01 μF]
Maximum Duty Cycle Pin 9 = 3.9V,
t
ON
/t
OSC
49 45 49 45 %
Min
[R
T
= 5.6k, C
T
= 0.01 μF]
Maximum Duty Cycle Pin 9 = 3.9V,
t
ON
/t
OSC
44 35 44 35 %
Min
[R
T
= 1k, C
T
= 0.001 μF]
V
COMPZ
Input Threshold Zero Duty Cycle 1 1 V
(Pin 9)
V
COMPM
Input Threshold (Pin 9) Maximum Duty Cycle 3.5 3.5 V
I
IB
Input Bias Current −1 −1 μA
CURRENT LIMIT SECTION
V
SEN
Sense Voltage V
(Pin 2)
− V
(Pin 1)
≥ 150 mV 180 180 mV
Min
200 200
220 220 mV
Max
TC-V
sense
Sense Voltage T.C. 0.2 0.2 mV/°C
Common Mode Voltage V
5
− V
4
= 300 mV −0.7 −0.7 V
Min
Range
1 1 V
Max
(5) OSC amplitude is measured open circuit. Available current is limited to 1 mA so care must be exercised to limit capacitive loading of fast
pulses.
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