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參數資料
| 型號： | L6731BTR |
| 廠商： | 意法半導體 |
| 英文描述： | 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 |
| 中文描述： | 可調式降壓同步整流專用的DDR控制器內存 |
| 文件頁數： | 15/24頁 |
| 文件大?。?/td> | 311K |
| 代理商： | L6731BTR |
L6731B
Device description
15/24
The device realizes the over-current-protection (OCP) sensing the current both on the high-
side MOSFET(s) and the low-side MOSFET(s) and so 2 current limit thresholds can be set (see
OCH pin and OCL pin in
Table 3.
Pins function):
Peak Current Limit
Valley Current Limit
●
●
The Peak Current Protection is active when the high-side MOSFET(s) is turned on, after a
masking time of about 100ns. The valley-current-protection is enabled when the low-side
MOSFET(s) is turned on after a masking time of about 400ns. If, when the soft-start phase is
completed, an over current event occurs during the on time (peak-current-protection) or during
the off time (valley-current-protection) the device enters in HICCUP mode: the high-side and
low-side MOSFET(s) are turned off, the soft-start capacitor is discharged with a constant
current of 10μA and when the voltage at the SS pin reaches 0.5V the soft-start phase restarts.
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
can't 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:
In constant current protection a current control loop limits the value of the error amplifier output
(comp), in order to avoid its saturation and thus recover faster when the output returns in
regulation.
Figure 9.
shows the behaviour of the device during an over current condition that
persists also in the soft-start phase.
Figure 8.
OVP: the low-side MOSFET is turned-on in advance.
V
OUT
V
FB
LGate
109%
MIN
ON
VALLEY
MAX
T
L
Vout
Vin
I
I
,
+
=
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