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HIP6013 Datasheet(PDF) 5 Page - Renesas Technology Corp

Part # HIP6013
Description  Buck Pulse-Width Modulator (PWM) Controller
Download  11 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HIP6013 Datasheet(HTML) 5 Page - Renesas Technology Corp

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HIP6013
FN4325 Rev 1.00
Page 5 of 11
November 3, 2005
Functional Description
Initialization
The HIP6013 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 (VIN) on the OCSET pin. The level on OCSET is
equal to VIN less a fixed voltage drop (see over-current
protection). With the EN pin held to VCC, the POR function
initiates soft start operation after both input supply voltages
exceed their POR thresholds. For operation with a single
+12V power source, VIN and VCC are equivalent and the
+12V power source must exceed the rising VCC 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
A current source charges an external capacitor
(CSS) 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 CSS = 0.1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 reference voltage and the
output voltage is in regulation. This method provides a rapid
and controlled output voltage rise.
Over-Current Protection
The over-current function protects the converter from a
shorted output by using the upper MOSFET’s on-resistance,
rDS(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 (ROCSET)
programs the over-current trip level. An internal 200
A
(typical) current sink develops a voltage across ROCSET that
is reference to VIN. When the voltage across the upper
MOSFET (also referenced to VIN) exceeds the voltage
across ROCSET, the over-current function initiates a soft-
start sequence. The soft-start function discharges CSS with
a 10
A current sink and inhibits PWM operation. The soft-
start function recharges CSS, and PWM operation resumes
with the error amplifier clamped to the SS voltage. Should an
overload occur while recharging CSS, the soft start function
inhibits PWM operation while fully charging CSS to 4V to
complete its cycle. Figure 4 shows this operation with an
overload condition. Note that the inductor current increases
to over 15A during the CSS charging interval and causes an
over-current trip. The converter dissipates very little power
with this method. The measured input power for the
conditions of Figure 4 is 2.5W.
TIME (5ms/DIV)
SOFT-START
(1V/DIV)
0V
0V
t1
t2
t3
OUTPUT
(1V/DIV)
VOLTAGE
FIGURE 3. SOFT-START INTERVAL


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