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參數(shù)資料
| 型號(hào)： | LV5040V |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2 A DUAL SWITCHING CONTROLLER, 340 kHz SWITCHING FREQ-MAX, PDSO30 |
| 封裝： | 0.275 INCH, SSOP-30 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 378K |
| 代理商： | LV5040V |
LV5040V
No.A0357-6/7
Pin Functions
Pin No.
Pin
Function
1
VDD
Gate drive power supply for the external low side MOSFETs. Connect this pin to VLIN8 through a filter.
2
LDRV1
Channel 1 external low side MOSFET gate drive.
This pin is also used as the signal input for short through prevention for the high and low side MOSFETs.
3
HDRV1
Channel 1 external high side MOSFET gate drive.
4
SW1
This pin is connected to the channel 1 switching node.
The external high side MOSFET source and the low side MOSFET drain are connected to this pin. The drain of the
discharging MOSFET used for the soft stop function is connected internal in the IC. This pin is also used as the signal
input for short through prevention for the high and low side MOSFETs.
5
CBOOT1
Channel 1 bootstrap capacitor connection.
The high side MOSFET gate drive power is supplied from this pin. This pin is connected to VDD through a diode and to
SW1 through the bootstrap capacitor.
6
RSNS1
Inverting (
) input for the channel 1 internal current detection amplifier input.
When resistor detection is used, connect the low side of the current detection resistor inserted between VIN and the
external high side MOSFET drain. When the MOSFET on-resistance is used for current detection, connect the high side
MOSFET source to this pin. Connect with independent wiring so that it does not become part of the main current common
impedance with respect to the detection voltage.
7
VLIN5
Internal 5 V regulator output.
The current is supplied from VIN. The power supply for the IC internal control circuits is also supplied from this pin. A
bypass capacitor (1.0
F) is required between this pin and SGND. The 5V regulator operates even when the IC is in the
standby state.
8
COMP1
Channel 1 phase compensation.
The output of the internal transconductance amplifier is connected to this pin. The external phase compensation circuit
between this pin and SGND.
9
FB1
Channel 1 feedback input.
The transconductance amplifier inverting (
) input is connected to this pin. Provide the feedback potential to this pin by
voltage dividing the output voltage.
10
ILIM1
Connection to the channel 1 overcurrent detection trip point.
A 10
A (ILIM) sink constant-current supply is connected internal in the IC, and the overcurrent detection voltage ILIM ×
RLIM is generated by connecting the resistor RLIM between this pin and VIN. The voltage between VIN and ILIM is
compared to the voltage across the terminals of either the current detection resistor RSNS or the high side MOSFET to
detect the overcurrent state.
11
KS1
Channel 1 internal current detection amplifier noninverting (
+) input.
Connect this pin to the current detection point with an independent line. If a current detection resistor is not used, detect
from a point as close as possible to the high side MOSFET drain.
12
UV_DELAY
Channel and channel 2 common UVP delay connection.
The time until the IC switches off after the UVP state is detected is set by the capacitor connected between this pin and
SGND. If either the channel 1 or channel 2 output voltage falls under 90% of the set voltage, an IC internal 5
A constant
current source charges the external capacitor connected to this pin. When the voltage on this pin exceeds 2.4V, the IC
switches off. If no external capacitor is connected, the IC turns off immediately upon detection of the UVP state.
13
TD
Channel and channel 2 common startup delay connection.
The time until the IC starts up after the power-on reset (POR) is cleared is set by the capacitor connected between this pin
and SGND. After the power-on reset is cleared (VIN > 9.3V), an IC internal 5A constant current source charges the
external capacitor connected to this pin. The IC starts operation when the voltage on this pin exceeds 2.4V. The IC goes
to the standby state when the voltage on this pin is under 2.4V. If no external capacitor is connected to this pin, the IC will
start as soon as the power-on reset is cleared. This capacitor is discharged by the TD pin when the overvoltage protection
function operates, after UV_DELAY times out, or if the thermal protection circuit operates.
14
VLIN8
Internal 8V regulator output. The current is supplied from VIN.
This output is used as the bootstrap power supply for the external MOSFETs. A bypass capacitor (4.7
F) is required
between this pin and SGND. The 8V regulator operates even when the IC is in the standby state.
15
VIN
IC power supply.
The IC starts operating when a 9.5V or higher level is applied. (After startup, the IC stops if this level falls below 9.0V.)
16
CLKO
Clock output.
This pin outputs a clock signal synchronized with the CT pin oscillator waveform. When two or more LV5040V chips are
operated in synchronization, Connect the CT pin of the slave device to the SLKO pin of the master device. If two or more
devices are operated in synchronization and the Td pin is used to change the startup timing between the devices, the
device that starts the soonest will be the master. Note that 10k
resistors must be inserted between the master CLKO and
the slave CT pins.
17
CT
Connection for the oscillator circuit's external capacitor.
Connect that capacitor between this pin and ground. When CT is 180pF, fOSC will be 300kHz.
Continued on next page.
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