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參數(shù)資料
| 型號(hào)： | ISL6522ACR |
| 廠(chǎng)商： | INTERSIL CORP |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | Adjustable Precision Shunt Regulator 3-SOT-89 0 to 70 |
| 中文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC16 |
| 封裝： | 5 X 5 MM, PLASTIC, MO-220VHHB, QFN-16 |
| 文件頁(yè)數(shù)： | 6/13頁(yè) |
| 文件大?。?/td> | 441K |
| 代理商： | ISL6522ACR |
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6
FN9122.2
April 13, 2005
monitored by the adaptive shoot through protection circuitry to
determine when the lower MOSFET has turned off.
PVCC
Provide a bias supply for the lower gate drive to this pin.
VCC
Provide a 12V bias supply for the chip to this pin.
Functional Description
Initialization
The ISL6522A automatically initializes upon receipt of
power. Special sequencing of the input supplies is not
necessary. The Power-On Reset (POR) function continually
monitors the input supply voltages and the enable (EN) pin.
The POR monitors the bias voltage at the VCC pin and the
input voltage (V
IN
) on the OCSET pin. The level on OCSET
is equal to V
IN
less a fixed voltage drop (see overcurrent
protection). With the EN pin held to V
CC
, the POR function
initiates soft-start operation after both input supply voltages
exceed their POR thresholds. For operation with a single
+12V power source, V
IN
and V
CC
are equivalent and the
+12V power source must exceed the rising V
CC
threshold
before POR initiates operation.
The POR function inhibits operation with the chip disabled
(EN pin low). With both input supplies above their POR
thresholds, transitioning the EN pin high initiates a soft-start
interval.
Soft-Start
The POR function initiates the soft-start sequence. An internal
10
μ
A current source charges an external capacitor (C
SS
) on
the SS pin to 4V. Soft-start clamps the error amplifier output
(COMP pin) to the SS pin voltage. Figure 3 shows the
soft-start interval. At t
1
in Figure 3, the SS and COMP
voltages reach the valley of the oscillator’s triangle wave. The
oscillator’s triangular waveform is compared to the ramping
error amplifier voltage. This generates PHASE pulses of
increasing width that charge the output capacitor(s). This
interval of increasing pulse width continues to t2, at which
point the output is in regulation and the clamp on the COMP
pin is released. This method provides a rapid and controlled
output voltage rise.
Overcurrent Protection
The overcurrent function protects the converter from a
shorted output by using the upper MOSFETs on-resistance,
r
DS(ON)
to monitor the current. This method enhances the
converter’s efficiency and reduces cost by eliminating a
current sensing resistor.
The overcurrent function cycles the soft-start function in a
hiccup mode to provide fault protection. A resistor (R
OCSET
)
programs the overcurrent trip level. An internal 200
μ
A
(typical) current sink develops a voltage across R
OCSET
that
FIGURE 3. SOFT-START INTERVAL
VOLTAGE
TIME
V
OSC(MIN)
t
0
t
1
t
2
CLAMP ON V
COMP
RELEASED AT STEADY STATE
V
COMP
V
SOFT START
V
OUT
t
1
C
SS
-----------
V
OSC MIN
(
)
=
t
SoftStart
t
2
t
1
–
C
SS
-----------
V
IN
------------------------------------------------
V
OSC
=
=
Where:
C
SS
= Soft Start Capacitor
I
SS
= Soft Start Current = 10
μ
A
V
OSC(MIN)
= Bottom of Oscillator = 1.35V
V
IN
= Input Voltage
V
OSC
= Peak to Peak Oscillator Voltage = 1.9V
V
OUTSteadyState
= Steady State Output Voltage
O
S
0A
0V
TIME (20ms/DIV)
5A
10A
15A
2V
4V
FIGURE 4. OVERCURRENT OPERATION
ISL6522A
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