L6730C STMicroelectronics, L6730C Datasheet - Page 21

• Manufacturer Part Number: L6730C
• Description: IC CTRLR ADJ STPDN SYNC 20-TSSOP
• Manufacturer: STMicroelectronics
• Type: Step-Down (Buck)r

Specifications of L6730C

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: Adj to 0.6V
• Frequency - Switching: 100kHz ~ 1MHz
• Voltage - Input: 1.8 ~ 14 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP Exposed Pad, 20-eTSSOP, 20-HTSSOP
• Package: HTSSOP20, QFN4x4 24L
• For Use With: 497-5868 - EVAL BOARD 30A 400KHZ L6730497-5501 - EVAL BOARD FOR L6730XX
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output: -
• Power - Output: -

L6730C - L6730D
Figure 13. OVP latched
Figure 14. OVP with sink enabled: the low-side MOSFET is turned-on in advance.
It must be taken into account that there is an electrical network between the output terminal and
the FB pin and therefore the voltage at this pin is not a perfect replica of the output voltage. If
the converter can sink current, in the most of cases the low-side will be turned-on before the
output voltage exceeds the over-voltage threshold, because the error amplifier will throw off
balance in advance. Even if the device doesn’t report an over-voltage, the behaviour is the
same, because the low-side is turned-on immediately. Instead, if the sink-mode is disabled, the
low-side will be turned-on only when the over-voltage-protection (OVP) operates and not
before, because the current can’t be reversed. In this case a delay between the output voltage
rising and the FB voltage rising can appear and the OVP can operate on late. The following two
figures show an over-voltage event in case of sink enabled and disabled. The output voltage
rises with a slope of 100mV/µs, emulating in this way the breaking of the high-side MOSFET as
an over-voltage cause.
109%
V
LGate
V
FB
OUT
Device description
LGate
OSC
FB
21/50