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| 型号： | LM5020SDX-2/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 9/17页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK INV 10LLP |
| 标准包装： | 4,500 |
| 系列： | PowerWise® |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 50% |
| 电源电压： | 13 V ~ 90 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 10-WDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 其它名称： | LM5020SDX-2 |
SNVS275F – MAY 2004 – REVISED APRIL 2006
Soft Start
The softstart feature allows the power converter to gradually reach the initial steady state operating point, thereby
reducing start-up stresses and current surges. At power on, after the V CC and the line undervoltage lockout
thresholds are satisfied, an internal 10μA current source charges an external capacitor connected to the SS pin.
The capacitor voltage will ramp up slowly and will limit the COMP pin voltage and the duty cycle of the output
pulses.
Gate Driver and Maximum Duty Cycle Limit
The LM5020 provides an internal gate driver (OUT), which can source and sink a peak current of 1 Amp. The
LM5020 is available in two duty cycle limit options. The maximum output duty cycle is typically 80% for the
LM5020-1 option and precisely equal to 50% for the LM5020-2 option. The maximum duty cycle function for the
LM5020-2 is accomplished with an internal toggle flip-flop which ensures an accurate duty cycle limit. The
internal oscillator frequency of the LM5020-2 is therefore twice the operating frequency of the PWM controller
(OUT pin).
The 80% maximum duty cycle limit of the LM5020-1 is determined by the internal oscillator and varies more than
the 50% limit of the LM5020-2. For the LM5020-1 the internal oscillator frequency and the operational frequency
of the PWM controller are equal.
Thermal Protection
Internal thermal shutdown circuitry is provided to protect the integrated circuit in the event the maximum junction
temperature is exceeded. This feature prevents catastrophic failures from accidental device overheating. When
activated, typically at 165 degrees Celsius, the controller is forced into a low power standby state, disabling the
output driver and the bias regulator. After the temperature is reduced (typical hysteresis = 25°C) the V CC
regulator is enabled and a softstart sequence initiated.
Typical Application Circuit: 36V - 75 V IN and 3.3V, 4.5A OUT
C9
R13
R10
C12
470 pF
J2
+3.3V
2
J1
30-75V IN
1
2
V+
GND
0.1 P F
20
D2
CMPD2838E
T1
10, 1W
D3
MBRD835L
C13
100 P F
C14
100 P F
C15
270 P F
1
OUT RTN
GND
GND
GND
C1
2.2 P F
C2
2.2 P F
R2
61.9k
R1
10
GND
Z1
1SMB5936B
GND
GND
GND
Shutdown
GND
GND
C4
0.1 P F
C10
4.7 P F
D1
CMPD2838E
GND
2.87k
C6
COMP
SS
C3
0.01 P F
GND GND
SYNC
Input
R5
15.0k
R3
C8
100 pF
R4
1.00k
R6
12.4k
GND GND
U1
1
VIN VCC
7
UVLO
OUT
3
CS
9 RT/
FB
10 SYNC
GND
LM5020
4
5
8
2
6
R7
100
R8
0.47
C11
1000 pF
Q1
Si7898DP
R9
0.47
GND
R11
2.43k
R12
1.47k
220 pF
C5
C7
0.01 P F
GND
GND
GND
3300 pF
GND
GND
Copyright ? 2004–2006, Texas Instruments Incorporated
Product Folder Links: LM5020
9
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