L6730 datasheet(24/52 Pages) STMICROELECTRONICS

tên linh kiện	L6730

Giải thích chi tiết về linh kiện	Adjustable step-down controller with synchronous rectification

PDF	52 Pages

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nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

Trang chủ	http://www.st.com

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24 / 52 page

Device description

L6730 - L6730B

24/52

Doc ID 11938 Rev 3

The L6730B can always sink current and so the OVP will operate always in advance. 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 4: Pin connection):

●

Peak current limit

●

Valley current limit

The peak current protection is active when the high-side MOSFET(s) is turned on, after an

adjustable masking time (see Chapter 5.10 on page 27). The valley-current-protection is

enabled when the low-side MOSFET(s) is turned on after a fix masking time of about 400

ns. 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

Figure 17.

OVP with sink enabled: the low-side MOSFET is turned-on in advance

Figure 18.

OVP with sink disabled: delay on the OVP operation

VOUT

109%

VFB

LGate

126%

VOUT

VFB

LGate

L6730 bảng dữ liệu(PDF) 24 Page - STMicroelectronics