參數(shù)資料
型號(hào)： ISL6740A
廠商： Intersil Corporation
英文描述： Flexible Double-Ended Voltage-Mode PWM Controller with Voltage Feed Forward
中文描述： 靈活的雙端電壓模式PWM控制器與電壓前饋
文件頁(yè)數(shù)： 8/15頁(yè)
文件大?。?/td> 320K
代理商： ISL6740A
8
FN9195.0
February 7, 2005
Pin Descriptions
V
DD
-
V
DD
is the power connection for the IC. To optimize
noise immunity, bypass V
DD
to GND with a ceramic
capacitor as close to the V
DD
and GND pins as possible.
The total supply current, I
DD
, will be dependent on the load
applied to outputs OUTA and OUTB. Total I
DD
current is the
sum of the quiescent current and the average output current.
Knowing the operating frequency, Fsw, and the output
loading capacitance charge, Q, per output, the average
output current can be calculated from:
SYNC -
A bidirectional synchronization signal used to
coordinate the switching frequency of multiple units.
Synchronization may be achieved by connecting the SYNC
signal of each unit together or by using an external master
clock signal. The oscillator timing capacitor, C
T
, is always
required regardless of the synchronization method used.
The paralleled unit with the highest oscillator frequency
assumes control.
R
TC
-
This is the oscillator timing capacitor charge current
control pin. A resistor is connected between this pin and
GND. The current flowing through the resistor determines
the magnitude of the charge current. The charge current is
nominally twice this current. The PWM maximum ON time is
determined by the timing capacitor charge duration. The
voltage appearing on this pin is nominally 80% of the voltage
applied to the UV/FF pin.
R
TD
-
This is the oscillator timing capacitor discharge current
control pin. A resistor is connected between this pin and
GND. The current flowing through the resistor determines
the magnitude of the discharge current. The discharge
current is nominally 50x this current. The PWM deadtime is
determined by the timing capacitor discharge duration. The
voltage appearing on this pin is nominally 80% of the voltage
applied to the UV/FF pin.
C
T
-
The oscillator timing capacitor is connected between
this pin and GND.
Typical Performance Curves
FIGURE 1. REFERENCE VOLTAGE vs TEMPERATURE
FIGURE 2. OSCILLATOR CT DISCHARGE CURRENT GAIN
FIGURE 3. DEADTIME (DT) vs CAPACITANCE
FIGURE 4. CAPACITANCE vs FREQUENCY
1.001
1
0.999
0.998
0.997
-40
-25
-10
5
20
35
50
65
80
95
110
TEMPERATURE (°C)
N
R
65
60
55
50
45
400
50
100
150
200
250
300
350
400
450
500
RTD CURRENT (μA)
C
110
4
110
3
100
10
10
20
30
40
50
60
70
80
90
100
RTD (k
)
D
470
330
220
100
CT (pF) =
1000
680
110
6
110
4
60
70
80
90
100
RTC (k
)
F
10
20
30
40
50
680
1000
330
470
220
100
CT (pF) =
RTD = 10K
110
5
I
OUT
2
Q
F
SW
=
A
(EQ. 1)
ISL6740A
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