参数资料
| 型号： | LV5768M-TLM-H |
| 厂商： | ON Semiconductor |
| 文件页数： | 9/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM MFP14S |
| 标准包装： | 1,000 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 500kHz |
| 占空比： | 95% |
| 电源电压： | 8.5 V ~ 42 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | * |
| 包装： | * |
LV5768M
? Part selection and set
1) Output voltage set
Output voltage (VOUT) is shown the equation (1).
R4 22k ?
VOUT = (1 + R3 )×VREF = (1 + 1.3k ? )×0.67 (typ)
[V]
(1)
Ex) To set output voltage of 12V, set resistors as follows: R3=1.3k ? and R4=22k ? .
2) Soft start set
Soft start capacitor (C5) is obtained by the equation (2).
C5 =
ISS×TSS
VREF
5μ×TSS
= 0.67V
[μF]
(2)
ISS: Charge current value, TSS: soft start time
Ex) To set soft start time of 15ms (approx.), set C5=0.1μF.
3) Overcurrent protector set
Overcurrent limit setting resistor (R5) is obtained by the equation (3).
R5 =
Rdson×IL max
IIlim
=
Rdson×IL max
18.5μ
[ ? ]
(3)
IIlim: ILIM current value,
ILmax: the maximum value of coil current,
Rdson: Ron between drain and source of Q1 (upper Nch MOS FET).
Ron of ATP201 ≈ 23m ? (when VGS=4.5V at 25°C)
Ex) To set current limit operation point to 11.3A (load current) where coil peak current value is 12A
(approx.), set R5 = 15k ? . Set an optimum resistor taking variation of ON resistor into consideration due
to temperature change and make sure to confirm it with the user's specific board. For C6, connect a
capacitor of 1000pF to filter unwanted noise for the proper operation of current limiting.
ON resistor of FET
* Rdson of FET has its own temperature coefficient and the resistor becomes higher in proportion to the
temperature.
* To set Rdson value within the range of operating temperature, it is advisable that the user confirm the data sheet
by the FET supplier.
4) How to set oscillation frequency
Oscillation frequency Fosc is adjustable by RT resistor as
shown in the correlation chart as follows:
SW frequency setting range: 80kHz to 500kHz
500
450
400
350
300
250
200
150
100
50
0
FOSC -- RT
0
50
100
150
200
250
300
350
400
450
500
Resistance, RT - k Ω
5) Boot strap capacitor set
For boot strap capacitor C2, use capacitor 100 times larger than Ciss of power MOSFET.
PS No.A1988-9/15
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