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ISL6841 Datasheet(PDF) 8 Page - Intersil Corporation

Part # ISL6841
Description  Improved Industry Standard Single-Ended Current Mode PWM Controller
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL6841 Datasheet(HTML) 8 Page - Intersil Corporation

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8
FN9124.8
April 16, 2007
Pin Descriptions
RTCT - This is the oscillator timing control pin. The
operational frequency and maximum duty cycle are set by
connecting a resistor, RT, between VREF and this pin and a
timing capacitor, CT, from this pin to GND. The oscillator
produces a sawtooth waveform with a programmable
frequency range up to 2.0MHz. The charge time, tC, the
discharge time, tD, the switching frequency, f, and the
maximum duty cycle, Dmax, can be calculated from
Equations 1, 2, 3 and 4:
Figure 4 may be used as a guideline in selecting the
capacitor and resistor values required for a given frequency.
COMP - COMP is the output of the error amplifier and the
input of the PWM comparator. The control loop frequency
compensation network is connected between the COMP and
FB pins.
FB - The output voltage feedback is connected to the
inverting input of the error amplifier through this pin. The
non-inverting input of the error amplifier is internally tied to a
reference voltage.
CS - This is the current sense input to the PWM comparator.
The range of the input signal is nominally 0V to 1.0V and has
an internal offset of 100mV.
GND - GND is the power and small signal reference ground
for all functions.
OUT - This is the drive output to the power switching device.
It is a high current output capable of driving the gate of a
power MOSFET with peak currents of
1.0A. This GATE
output is actively held low when VDD is below the UVLO
threshold.
VDD - VDD is the power connection for the device. The total
supply current will depend on the load applied to OUT. Total
IDD current is the sum of the operating current and the
Typical Performance Curves
FIGURE 1. FREQUENCY vs TEMPERATURE
FIGURE 2. REFERENCE VOLTAGE vs TEMPERATURE
FIGURE 3. EA REFERENCE vs TEMPERATURE
FIGURE 4. RESISTANCE FOR CT CAPACITOR VALUES GIVEN
1.02
1.01
1.00
0.99
0.98
0.97
-40
-10
20
50
80
110
TEMPERATURE (°C)
TEMPERATURE (°C)
1.001
1.000
0.999
0.998
0.997
0.996
0.995
-40 -25
-10
5
20
35
50
65
80
95 110
TEMPERATURE (°C)
1.002
1.000
0.998
0.996
0.994
-40 -25
-10
5
20
35
50
65
80
95
110
103
100
10
1
10
20
30
40
50
60
70
80
90
100
RT (k
Ω)
100pF
220pF
330pF
470pF
1.0nF
2.2nF
3.3nF
4.7nF
t
C
0.583
RT
CT
(EQ. 1)
t
D
RT
CT
0.0083
RT
4.3
0.0083
RT
2.4
----------------------------------------------
⎝⎠
⎛⎞
ln
(EQ. 2)
f
1t
C
t
D
+
()
=
(EQ. 3)
Dt
C
f
=
(EQ. 4)
ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845


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