参数资料
| 型号： | ISL78220ANEZ-T |
| 厂商： | Intersil |
| 文件页数： | 15/22页 |
| 文件大小： | 0K |
| 描述： | IC PWM CONTROLLER |
| 标准包装： | 1,000 |
| 系列： | * |
ISL78220
V
Vfb
SOFT-START WAVEFORM (CASE B, LIGHT LOAD)
V
Vfb
SOFT-START WAVEFORM (CASE C)
0
Vref
t4
t5
NOTE: t4, t5 PERIOD ARE FROM FIGURE 5
t6 t7
0
Vref
t4
t5
NOTE: t4, t5 PERIOD ARE FROM FIGURE 5
t6
V
DIODE EMULATION
SYNCHRONOUS
OPERATION WITH
V
5V
LOWER FET TURN ON
CYCLE-BY-CYCLE
DIODE EMULATION
(PWM_INV = 0)
5V
LOWER FET TURN ON
(PWM_INV = 0)
2.5V
0
DIODE EMULATION
SYNCHRONOUS
OPERATION WITH
CYCLE-BY-CYCLE
PWM
0
PWM
5V
2.5V
DIODE EMULATION
(PWM_INV = 1)
PWM
5V
(PWM_INV = 1)
PWM
0
5V
DRIVE_EN
0
FIGURE 16. SOFT-START WAVEFORM (CASE B, LIGHT LOAD)
Case C (V PWM_TRI = 0)
For applications that the driver cannot identify a tri-state PWM signal,
the V PWM_TRI should be connected to GND (Logic LOW), such that
the PWM signal will only be 2 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 t 4 , t 5 : Same as the t 4 , t 5 in Figure 14, soft-start has not
Time t 6 : At the beginning of t 6 , 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 t 6 to
enable the external drivers.
15
0
5V
DRIVE_EN
0
FIGURE 17. SOFT-START WAVEFORM (CASE C, LIGHT LOAD)
FN7688.3
December 24, 2013
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相关代理商/技术参数 |
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