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參數(shù)資料
| 型號： | LX1684 |
| 廠商： | Microsemi Corporation |
| 英文描述： | Voltage-Mode PWM Controller |
| 中文描述： | 電壓模式PWM控制器 |
| 文件頁數(shù)： | 2/12頁 |
| 文件大小： | 294K |
| 代理商： | LX1684 |
Microsemi
Linfinity Microelectronics Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
Copyright
2000
Rev. 1.0, 2001-09-19
W
M
.
C
LX1684
Voltage-Mode PWM Controller
P
RODUCTION
L I N F I N I T Y D I V I S I O N
A B S O L U T E M A X I M U M R A TI N G S ( N O T E 1 )
Supply Voltage (V
C1
) ......................................................................................18V
Supply Voltage (V
CC
)........................................................................................7V
Input Voltage (CSP Pin)..................................................................................14V
Output Drive Peak Current Source (500ns)....................................................1.0A
Output Drive Peak Current Sink (500ns)........................................................1.0A
Input Voltage (SS/ENABLE Pin)...........................................................-0.3 to 6V
Operating Junction Temperature..................................................................150°C
Storage Temperature ...................................................................-65°C to +150°C
Lead Temperature (Soldering 10 Seconds) ..................................................300°C
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal.
P A C K A G E P I N O U T
1
2
4
3
14
13
11
12
14-P
IN
SOIC
(Top View)
5
6
10
7
9
8
TDRV
N/C
V
C1
N/C
CS
N/C
V
CC
FB
N/C
SS
VCSP
GND
PGND
BDRV
T H E R M A L D A T A
D
THERMAL RESISTANCE
-
JUNCTION TO AMBIENT
,
θ
JA
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
θ
JA
).
The
θ
JA
numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.
P
ACKAGE
165
°
C/W
F U N C T I O N A L P I N D E S C R I P T I O N
P
IN
N
AME
D
ES CRIPT ION
V
FB
Voltage Feedback. A 1.25V reference is connected to a resistor divider to set desired output voltage.
SS
Soft-Start And Hiccup Capacitor Pin. During start up the voltage of this pin controls the output voltage. An
internal 22k
resistor and the external capacitor set the time constant for soft-startup. Soft-start does not begin
until the supply voltage exceeds the UVLO threshold. When over-current occurs, this capacitor is used for timing
hiccup. The PWM can be disabled by pulling the SS pin below 0.3V
Positive Over-Current Threshold Input
VCSP
GND
Analog ground for SS, FB, CS and VCC.
PGND
MOSFET driver power ground
TDRV
Gate Drive For Upper MOSFET.
BDRV
Gate Drive For Lower MOSFET.
V
C1
Separate Supply For MOSFET Gate Drives. Connect to gate drive voltage.
CS
Over-Current Set. Connect resistor between CS pin and the source of the upper MOSFET to set current-limit
point.
IC Supply Voltage (nominal 5V).
V
CC
P
A
C
K
A
G
E
D
A
T
A
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