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| ISL6740_14 Datasheet, PDF (8/28 Pages) Intersil Corporation – Flexible Double Ended Voltage and Current Mode PWM Controllers | |||
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ISL6740, ISL6741
Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to âFunctional Block Diagramâ on
page 2 and page 3 and Typical Application Schematics on page 4 to page 6. 9V < VDD < 20 V, RTD = 51.1kΩ, RTC = 10kΩ, CT = 470pF, TA = -40°C
to +105°C, Typical values are at TA = +25°C. Boldface limits apply over the operating temperature range, -40°C to +105°C (Continued)
PARAMETER
TEST CONDITIONS
MIN
(Note 7) TYP
MAX
(Note 7)
UNITS
Gain (ISL6741)
SCSET Input Impedance
ACS = ÎVERROR/ÎVCS
-
4
1
-
-
V/V
-
MΩ
SC Setpoint Accuracy
-
10
-
%
PULSE WIDTH MODULATOR
VERROR Input Impedance
Minimum Duty Cycle
VERROR < CS Offset (ISL6741)
VERROR < CT Valley Voltage (ISL6740)
Maximum Duty Cycle
VERROR > 4.75V (Note 9)
VERROR to PWM Comparator Input Offset (ISL6741)
VERROR to PWM Comparator Input Gain (ISL6741)
VERROR to PWM Comparator Input Gain (ISL6740)
CT to PWM Comparator Input Gain (ISL6740)
SS to PWM Comparator Input Gain (ISL6740)
400
-
-
kΩ
-
-
0
%
-
-
0
%
-
83
-
%
0.4
1.0
1.25
V
-
0.25
-
-
0.4
-
V/V
-
0.4
-
V/V
-
0.5
-
V/V
SS to PWM Comparator Input Gain (ISL6741)
-
0.2
-
V/V
OSCILLATOR
Frequency Accuracy
Frequency Variation with VDD
Temperature Stability
TA = +25°C
T = +105°C (f20V- - f9V)/f9V
T = -40°C (f20V- - f9V)/f9V
333 351
369
kHz
-
2
3
%
-
2
3
%
-
8
-
%
Charge Current Gain
1.88 2.0
2.12
µA/µA
Discharge Current Gain
45
55
65
µA/µA
CT Valley Voltage
CT Peak Voltage
RTD, RTC Voltage
SYNCHRONIZATION
RLOAD = 0
0.75 0.80
0.85
V
2.70 2.80
2.90
V
-
2.000
-
V
Input High Threshold (VIH), Minimum
4.0
-
-
V
Input Low Threshold (VIL), Maximum
-
-
0.8
V
Input Impedance
4.5
-
kΩ
Input Frequency Range
Free
-
1.67 x
Hz
Running
Free Running
High Level Output Voltage (VOH)
Low Level Output Voltage (VOL)
SYNC Output Current
ILOAD = -1mA
ILOAD = 10µA
VOH > 2.0V
-
4.5
-
V
-
-
100
mV
-10
-
-
mA
SYNC Output Pulse Duration (Minimum)
(Note 8)
250
-
532
ns
SYNC Advance
SOFT-START
SYNC rising edge to GATE falling edge,
CGATE = CSYNC = 100pF
-
5
-
ns
Charging Current
SS = 2V
-45
-55
-75
µA
8
FN9111.6
December 2, 2011
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