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參數(shù)資料
| 型號： | HA16120FPJ |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | CAP 1000PF 25V 5% NP0(C0G) SMD-0603 TR-7 PLATED-NI/SN |
| 中文描述： | 開關(guān)穩(wěn)壓器的斬波式直流/直流轉(zhuǎn)換器 |
| 文件頁數(shù)： | 17/38頁 |
| 文件大小： | 275K |
| 代理商： | HA16120FPJ |
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HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
17
7.2 Intermittent Mode Timing Diagram (V
ON/
OFF
only)
!
Figure 7.2 Intermittent Mode Timing Diagram (V
ON/
OFF
only)
"
#
V
BE
2V
BE
3V
BE*1
V
ON/OFF
b
Off
On
On
c
0 V
2T
ON
T
OFF
T
ON
t
a
a.
b.
c.
Note: 1.
Continuous overcurrent is detected
Intermittent operation starts (IC is off)
Voltage if overcurrent ends (thick dotted line)
V
is the base-emitter voltage of internal transistors, and is approximately 0.7 V.
(See the figure 6.1.)
For details, see the overall waveform timing diagram.
IC is on
c
IC is off
7.3 Calculation of Intermittent Mode Timing
Intermittent mode timing is calculated as follows.
(1) T
ON
(time until the IC shuts off when continuous overcurrent occurs)
2V
BE
V
BE
×
1
1
On duty*
T
ON
= C
ON/OFF
×
R
B
×
ln
= C
ON/OFF
×
R
B
×
ln2
×
≈
0.69
×
C
ON/OFF
×
R
B
×
1
1
On duty*
1
1
On duty*
(2) T
OFF
(time from when the IC shuts off until it next turns on)
V
IN
V
BE
V
IN
2V
BE
T
OFF
= C
ON/OFF
×
(R
A
+ R
B
)
×
ln
Where V
BE
≈
0.7 V
The greater the overload, the sooner the pulse-by-pulse current limiter operates, the smaller t
ON
becomes,
and from the first equation (1) above, the smaller T
ON
becomes. From the second equation (2), T
OFF
depends on V
IN
. Note that with the connections shown in the diagram, when V
IN
is switched on the IC does
not turn on until T
OFF
has elapsed.
Sawtooth wave
Point at which the current
limiter operates
PWM output
(In case of HA16114)
T
t
ON
Dead-band voltage
Note: On duty is the percent of time the IC output is on during one PWM cycle
when the pulse-by-pulse current limiter is operating.
On duty =
×
100 (%)
t
ON
T
Where T = t/f
OSC
Figure 7.3
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