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ISL78220 Datasheet(PDF) 15 Page - Renesas Technology Corp

Part No. ISL78220
Description  6-Phase Interleaved Boost PWM Controller with Light Load Efficiency Enhancement
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

ISL78220 Datasheet(HTML) 15 Page - Renesas Technology Corp

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ISL78220
FN7688 Rev 4.00
Page 15 of 22
September 2, 2014
Case C (VPWM_TRI = 0)
For applications that the driver cannot identify a tri-state PWM signal,
the VPWM_TRI should be connected to GND (Logic LOW), such that
the PWM signal will only be two levels between 0V and 5V. Then
DRIVE_EN pin can be connected to the EN pin of the external drivers.
DRIVE_EN will be asserted when the PWM first toggles such that the
pre-bias start up capability can be achieved. Detailed soft-start for
case C is shown in Figure 17.
Time t4, t5: Same as the t4, t5 in Figure 14, soft-start has not
started yet, see “Operation Initialization Before Soft-Start” on
page 13 for detailed description.
Time t6: At the beginning of t6, the PWM signal will start to
switch between 0V and 5V. The driver will turn on the lower and
upper MOSFETs accordingly, and the duty cycle for lower MOSFET
will increase gradually from 0 to steady state. DRIVE_EN will be
pulled high when the first PWM toggles at the beginning of t6 to
enable the external drivers.
FIGURE 16. SOFT-START WAVEFORM (CASE B, LIGHT LOAD)
(Note: t4, t5 periods are from Figure 5)
Vfb
Vref
t4
t6
t7
2.5V
V
V
5V
0
0
PWM
SOFT-START WAVEFORM(CASEB, LIGHT LOAD)
DIODEEMULATION
0
DRIVE_EN
t5
LOWERFET TURNON
DIODEEMULATION
2.5V
5V
5V
0
PWM
(PWM_INV=0)
(PWM_INV= 1)
SYNCHRONOUS
OPERATIONWITH
CYCLE-BY-CYCLE
DIODEEMULATION
SYNCHRONOUS
OPERATIONWITH
CYCLE-BY-CYCLE
DIODEEMULATION
FIGURE 17. SOFT-START WAVEFORM (CASE C, LIGHT LOAD)
(Note: t4, t5 periods are from Figure 5)
Vfb
Vref
t4
t6
V
V
5V
0
0
SOFT-START WAVEFORM(CASEC)
0
DRIVE_EN
t5
LOWERFET TURNON
5V
5V
0
PWM
(PWM_INV= 0)
PWM
(PWM_INV= 1)


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