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參數(shù)資料
| 型號： | HIP6002 |
| 廠商： | Intersil Corporation |
| 英文描述： | Rectifier (PWM) Controller and Output Voltage Monitor(整流器PWM控制器和輸出電壓檢測器) |
| 中文描述： | 整流器（PWM）控制器和輸出電壓監(jiān)視器（整流器的PWM控制器和輸出電壓檢測器） |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 211K |
| 代理商： | HIP6002 |
5
BOOT (Pin 15)
This pin provides bias voltage to the upper MOSFET driver.
A bootstrap circuit may be used to create a BOOT voltage
suitable to drive a standard N-Channel MOSFET.
PGND (Pin 16)
This is the power ground connection. Tie the lower MOSFET
source to this pin.
LGATE (Pin 17)
Connect LGATE to the lower MOSFET gate. This pin
provides the gate drive for the lower MOSFET.
VCC (Pin 18)
Provide a 12V bias supply for the chip to this pin.
OVP (Pin 19)
The OVP pin can be used to drive an external SCR in the
event of an overvoltage condition.
RT (Pin 20)
This pin provides oscillator switching frequency adjustment.
By placing a resistor (R
T
) from this pin to GND, the nominal
200kHz switching frequency is increased according to the
following equation:
6
T
Conversely, connecting a pull-up resistor (R
T
) from this pin
to V
CC
reduces the switching frequency according to the
following equation:
7
T
Functional Description
Initialization
The HIP6002 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 over-current
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 Power-On Reset (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) and reference input (+
terminal of error amp) to the SS pin voltage. Figure 3
shows the soft start interval with C
SS
= 0.1
μ
F. Initially the
clamp on the error amplifier (COMP pin) controls the
converter’s output voltage. At t1 in Figure 3, the SS voltage
reaches 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. With
sufficient output voltage, the clamp on the reference input
controls the output voltage. This is the interval between t2
and t3 in Figure 3. At t3 the SS voltage exceeds the
DACOUT voltage and the output voltage is in regulation.
This method provides a rapid and controlled output voltage
rise. The PGOOD signal toggles ‘high’ when the output
voltage (VSEN pin) is with in
±
5% of DACOUT. The 2%
hysteresis built into the power good comparators prevents
PGOOD oscillation due to nominal output voltage ripple.
Over-Current Protection
The over-current function protects the converter from a
shorted output by using the upper MOSFET’s 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 over-current function cycles the soft-start function in a
hiccup mode to provide fault protection. A resistor (R
OCSET
)
programs the over-current trip level. An internal 200
μ
A current
sink develops a voltage across R
OCSET
that is referenced to
V
IN
. When the voltage across the upper MOSFET (also
referenced to V
IN
) exceeds the voltage across R
OCSET
, the
over-current function initiates a soft-start sequence. The soft-
start function discharges C
SS
with a 10
μ
A current sink and
Fs
200kHz
--------------------
)
+
≈
(R
T
to GND)
Fs
200kHz
--------------------
)
–
≈
(R
T
to 12V)
0V
0V
0V
TIME (5ms/DIV)
SOFT-START
(1V/DIV)
OUTPUT
VOLTAGE
(1V/DIV)
t
2
t
3
PGOOD
(2V/DIV)
t
1
FIGURE 3. SOFT START INTERVAL
HIP6002
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|---|---|
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