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参数资料
| 型号： | ISL6843IUZ |
| 厂商： | INTERSIL CORP |
| 元件分类： | 稳压器 |
| 英文描述： | Improved Industry Standard Single-Ended Current Mode PWM Controller |
| 中文描述： | 1 A SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | ROHS COMPLIANT, PLASTIC, MO-187AA, MSOP-8 |
| 文件页数： | 7/11页 |
| 文件大小： | 307K |
| 代理商： | ISL6843IUZ |
7
FN9124.6
June 28, 2005
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, T
C
, the
discharge time, T
D
, the switching frequency, f, and the
maximum duty cycle, Dmax, can be calculated from the
following equations:
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 0 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 V
DD
is below the UVLO
threshold.
Typical Performance Curves
FIGURE 1. FREQUENCY vs TEMPERATURE
FIGURE 2. REFERENCE VOLTAGE vs TEMPERATURE
FIGURE 3. EA REFERENCE vs TEMPERATURE
FIGURE 4. RTCT vs FREQUENCY
1.02
1.01
1
0.99
0.98
0.97-40
-10
20
50
80
110
TEMPERATURE (°C)
N
TEMPERATURE (
°
C)
N
R
1.001
1
0.999
0.998
0.997
0.996
0.995
-40
-25
-10
5
20
35
50
65
80
95 110
TEMPERATURE (°C)
N
1.002
1
0.998
0.996
0.994
-40 -25
-10
5
20
35
50
65
80
95
110
1-10
3
100
10
1
10
20
30
40
50
RT (k
)
60
70
80
90
100
F
CT=
100pF
220pF
330pF
470pF
1.0nF
2.2nF
3.3nF
4.7nF
TC
0.583
RT
CT
≈
(EQ. 1)
TD
RT
–
CT
0.0083
RT
2.4
–
----------------------------------–
ln
≈
(EQ. 2)
f
1
TC
TD
+
(
)
=
(EQ. 3)
D
TC
f
=
(EQ. 4)
ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845
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