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參數(shù)資料
| 型號(hào)： | L6725TR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | Low cost adjustable step-down controller |
| 中文描述： | 低成本可調(diào)降壓控制器 |
| 文件頁數(shù)： | 15/27頁 |
| 文件大?。?/td> | 489K |
| 代理商： | L6725TR |
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L6725
Device description
15/27
5.9
Hiccup mode
During the soft-start phase the OCP provides a constant-current-protection. If during the T
ON
the OCH comparator triggers an over current the high-side MOSFET(s) is immediately turned
OFF (after the masking time and the internal delay) and returned on at the next pwm cycle. The
limit of this protection is that the T
ON
cannot be less than masking time plus propagation delay,
because during the masking time the peak-current-protection is disabled. In case of very hard
short circuit, even with this short T
ON
, the current could escalate. The valley-current-protection
is very helpful in this case to limit the current. If during the off-time the OCL comparator triggers
an over current, the high-side MOSFET(s) is not turned on until the current is over the valley-
current-limit. This implies that, if it is necessary, some pulses of the high-side MOSFET(s) will
be skipped, guaranteeing a maximum current due to the following formula:
5.10 Thermal shutdown
When the junction temperature reaches 150°C ±10°C the device enters in thermal shutdown.
Both MOSFETs are turned OFF and the soft-start capacitor is rapidly discharged with an
internal switch. The device does not restart until the junction temperature goes down to 120°C
and, in any case, until the voltage at the soft-start pin reaches 500mV.
Figure 9.
Constant current and Hiccup Mode during an OCP.
VSS
VCOMP
I
L
MIN
ON
VALLEY
MAX
T
L
Vout
Vin
I
I
,
+
=
(1)
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| L6728 | Single phase PWM controller with PowerGOOD |
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| L6731BTR | Transistor; Type: Amplifiers/Bipolar; VCEO (V): -25; Ic (A): -1; Pc (W): 0.8; hFE: 85 to 330; VCE (sat) (V) max: -0.5; Package: TO-92Mod |
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| L6726A_07 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Single phase PWM controller |
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