ISL6740 Datasheet, PDF (8/29 Pages) Intersil Corporation – Flexible Double Ended Voltage and Current Mode PWM Controllers

ISL6740, 1SL6741
Electrical Specifications
Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application
Schematic. 9V < V_DD < 20 V, R_TD = 51.1kΩ, R_TC = 10kΩ, C_T = 470pF, T_A = -40°C to +105°C (Note 3), Typical
values are at T_A = +25°C (Continued)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
PULSE WIDTH MODULATOR
V_ERROR Input Impedance
Minimum Duty Cycle
Maximum Duty Cycle
V_ERROR to PWM Comparator Input Offset
(ISL6741)
V_ERROR < CS Offset (ISL6741)
V_ERROR < C_T Valley Voltage (ISL6740)
V_ERROR > 4.75V (Note 6)
(Note 4)
400
-
-
kΩ
-
-
0
%
-
-
0
%
-
83
-
%
0.4
1.0
1.25
V
V_ERROR to PWM Comparator Input Gain (ISL6741) (Note 4)
V_ERROR to PWM Comparator Input Gain (ISL6740) (Note 4)
C_T to PWM Comparator Input Gain (ISL6740)
(Note 4)
SS to PWM Comparator Input Gain (ISL6740)
(Note 4)
-
0.25
-
-
0.4
-
V/V
-
0.4
-
V/V
-
0.5
-
V/V
SS to PWM Comparator Input Gain (ISL6741)
(Note 4)
-
0.2
-
V/V
OSCILLATOR
Frequency Accuracy
Frequency Variation with V_DD
Temperature Stability
T_A = +25°C
T = +105°C (f_20V- - f_9V)/f_9V
T = -40°C (f_20V- - f_9V)/f_9V
(Note 4)
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
C_T Valley Voltage
C_T Peak Voltage
RTD, RTC Voltage
SYNCHRONIZATION
R_LOAD = 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
(Note 4)
0.6x
- Free Running Hz
Free
Running
High Level Output Voltage (VOH)
Low Level Output Voltage (VOL)
SYNC Output Current
I_LOAD = -1mA
I_LOAD = 10μA
VOH > 2.0V (Note 4)
-
4.5
-
V
-
-
100
mV
-10
-
-
mA
SYNC Output Pulse Duration (minimum)
(Notes 4, 5)
250
-
400
ns
SYNC Advance
SYNC rising edge to GATE falling edge,
C_GATE = C_SYNC = 100pF
(Note 4)
-
5
-
ns
SOFTSTART
Charging Current
SS = 2V
-45
-55
-75
μA
SS Clamp Voltage
4.35
4.5
4.65
V
Sustained Over Current Threshold Voltage
(ISL6740)
Charged Threshold minus:
0.20
0.25
0.30
V
8
FN9111.4
July 13, 2007