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ISL6558 Datasheet

  • ISL6558

  • Multi-Purpose Precision Multi-Phase PWM Controller With Opti...

  • 16頁

  • INTERSIL   INTERSIL

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ISL6558
PWM1, 5V/DIV
ISL6558
+
0V
PWM2, 5V/DIV
OC
0V
PWM3, 5V/DIV
-
+
+
I
TOTAL
I
TRIP
82.5碌A(chǔ)
ISEN1
ISEN2
鈭?/div>
n
+
ISEN4
+ ISEN3
0V
PWM4, 5V/DIV
n = ACTIVE CHANNELS
0V
1ms/DIV
FIGURE 6. INTERNAL OVERCURRENT DETECTION
CIRCUITRY
FIGURE 4. FOUR ACTIVE CHANNEL PWM DRIVE SIGNALS
The PWM drive signals are switched out of phase. The PWM
drive signal phase relationship is 360擄 divided by the number
of active channels. Figure shows the PWM drive signals for
a four channel converter running at 125kHz. Each PWM
drive signal is 90擄 out of phase with the other.
V
OUT
(1V/DIV)
0V
SHORT APPLIED
I
OUT
(5A/DIV)
Frequency Setting
A resistor, R
T
, connected between the FS/EN pin and
ground sets the frequency of the internal oscillator. Tying the
FS/EN pin to ground disables the oscillator, thus shutting
down the converter. The resistor can be calculated given the
desired channel switching frequency, F
SW
.
R
T
=
10
10.9
鈥?/div>
1.1 log F
SW
0A
SHORT REMOVED
PGOOD (5V/DIV)
0V
10ms/DIV
(EQ. 5)
Figure 5 provides a graph of oscillator frequency vs R
T
. The
maximum recommended channel frequency is 1.5MHz.
1,000
500
FIGURE 7. OVERCURRENT OPERATION
Reference Voltage
An internal 0.8V reference is used for both PWM duty cycle
determination as well as output voltage protection. The
reference is trimmed such that the system, including
amplifier offset voltages, is accurate to 鹵
1
% over
temperature range.
200
100
R
T
- kW
50
Fault Protection
The ISL6558 protects the load device from damaging stress
levels. The overcurrent trip point is integral in preventing
output shorts of varying degrees from causing current spikes
which would damage a load device. The output voltage
detection features insure a safe window of operation for the
load device.
20
10
5
2
1
10
Overcurrent
20
50
100 200
500 1,000 2,000
CHANNEL OSCILLATOR FREQUENCY, F
SW
, [kHz]
FIGURE 5. OSCILLATOR FREQUENCY vs R
T
The R
ISEN
resistor scales the voltage sampled across the
lower MOSFET and provides current feedback proportional
to the output current of each active channel. The ISEN
currents from all the active channels are averaged together
to form a scaled version of the total output current, I
TOTAL
.
FN9027.12
June 21, 2005
10

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