ISL6740A Datasheet, PDF (7/15 Pages) Intersil Corporation – Flexible Double-Ended Voltage-Mode PWM Controller with Voltage Feed Forward

ISL6740A
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
SOFT-START
Charging Current
SS = 2V
-45
-55
-75
µA
SS Clamp Voltage
4.35
4.5
4.65
V
Sustained Overcurrent Threshold Voltage
Charged Threshold minus:
0.20 0.25 0.30
V
Overcurrent/Short Circuit Discharge Current
SS = 2V
13
18
23
µA
Fault SS Discharge Current
SS = 2V
-
10.0
-
mA
Reset Threshold Voltage
0.25 0.27 0.33
V
FAULT
Fault High Level Output Voltage (VOH)
Fault Low Level Output Voltage (VOL)
Fault Rise Time
Fault Fall Time
OUTPUT
I_LOAD = -10mA
I_LOAD = 10mA
C_LOAD = 100pF (Note 4)
C_LOAD = 100pF (Note 4)
2.85
3.5
-
V
-
0.4
0.9
V
-
15
-
ns
-
15
-
ns
High Level Output Voltage (VOH)
Low Level Output Voltage (VOL)
Rise Time
Fall Time
THERMAL PROTECTION
V_REF - OUTA or OUTB,
I_OUT = -50mA, 1µS duration, C_VREF = 1.0µF
OUTA or OUTB - GND, I_OUT = 50mA,
1µs duration, C_VREF = 1.0µF
C_GATE = 1nF, V_DD = 15V (Note 4)
C_GATE = 1nF, V_DD = 15V (Note 4)
-
0.5
1.0
V
-
0.5
1.0
V
-
50
100
ns
-
40
80
ns
Thermal Shutdown
(Note 4)
135
145
155
°C
Thermal Shutdown Clear
(Note 4)
120
130
140
°C
Hysteresis, Internal Protection
(Note 4)
-
15
-
°C
OTS
Threshold
2.375 2.50 2.625
V
Hysteresis, Switched Current Amplitude
18
25
30
µA
UV/FF Undervoltage Inhibit/Feed Forward
Input Voltage Low/Inhibit Threshold
0.97 1.00 1.03
V
Hysteresis, Switched Current Amplitude
7
10
15
µA
Input High Clamp Voltage
4.8
-
-
V
Input Impedance
1
-
-
MΩ
FF Gain
V_RTD/V_FF, V_RTC/V_FF
0.78
0.8
0.82
V/V
Maximum Control Voltage
4.20
-
V_REF
V
NOTES:
3. Specifications at -40°C and 105°C are guaranteed by 25°C test with margin limits.
4. Guaranteed by design, not 100% tested in production.
5. SYNC pulse width is the greater of this value or the C_T discharge time.
6. This is the maximum duty cycle achievable using the specified values of R_TC, R_TD, and C_T. Larger or smaller maximum duty cycles may be
obtained using other values for these components. See Equations 2-4.
7. The oscillator frequency is affected by the tolerance of the timing components used. In particular, parasitic capacitance at the CT pin introduced
by layout, leads, and probes, etc. will lower the frequency.
7
FN9195.0
February 7, 2005