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| 型号： | L6732CTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | HTSSOP-16 |
| 文件页数： | 8/32页 |
| 文件大小： | 905K |
| 代理商： | L6732CTR |
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5 Device description
L6732C
16/32
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 10A 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 TON
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 TON 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 TON, 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.
VOUT
VFB
LGate
109%
MIN
ON
VALLEY
MAX
T
L
Vout
Vin
I
,
+
=
(4)
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| L6732 | SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
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