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UCCX809-1 PDF预览

UCCX809-1

更新时间: 2024-11-08 03:25:03
品牌 Logo 应用领域
德州仪器 - TI 控制器
页数 文件大小 规格书
11页 162K
描述
Economy Primary Side Controller

UCCX809-1 数据手册

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application  
INFO  
UCC1809-1/-2  
UCC2809-1/-2  
UCC3809-1/-2  
available  
Economy Primary Side Controller  
FEATURES  
DESCRIPTION  
User Programmable Soft Start With  
Active Low Shutdown  
The UCC3809 family of BCDMOS economy low power integrated circuits  
contains all the control and drive circuitry required for off-line and isolated  
DC-to-DC fixed frequency current mode switching power supplies with  
minimal external parts count. Internally implemented circuits include  
undervoltage lockout featuring startup current less than 100µA, a user ac-  
cessible voltage reference, logic to ensure latched operation, a PWM com-  
parator, and a totem pole output stage to sink or source peak current. The  
output stage, suitable for driving N-Channel MOSFETs, is low in the off  
state.  
User Programmable Maximum Duty  
Cycle  
Accessible 5V Reference  
Undervoltage Lockout  
Operation to 1MHz  
0.4A Source/0.8A Sink FET Driver  
Low 100µA Startup Current  
Oscillator frequency and maximum duty cycle are programmed with two  
resistors and a capacitor. The UCC3809 family also features full cycle soft  
start.  
The family has UVLO thresholds and hysteresis levels for off-line and  
DC-to-DC systems as shown in the table to the left.  
PART  
TURN ON  
TURN OFF  
The UCC3809 and the UCC2809 are offered in the 8 pin SOIC (D), PDIP  
(N), TSSOP (PW), and MSOP (P) packages. The small TSSOP and  
MSOP packages make the device ideal for applications where board  
space and height are at a premium.  
NUMBER THRESHOLD THRESHOLD  
UCCX809-1  
UCCX809-2  
10V  
15V  
8V  
8V  
TYPICAL APPLICATION DIAGRAM  
R
START  
V
IN  
FB  
1
1V  
+
1V  
REF  
NOISE  
FILTER  
+5V  
+
5V  
REF  
8
FEEDBACK  
C
6µA  
SS  
REF  
2
+
V
SLOPE  
COMP  
OUT  
CURRENT  
SENSE  
0.5V  
VDD  
C
SS  
7
+
15/8V  
10/8V  
DISABLE  
UVLO  
17.5V  
C
VDD  
RT1  
RT2  
PWM  
LATCH  
3
4
OUT  
GND  
R
Q
S
CLK  
OSC  
6
5
+
V
REF  
C
T
UDG-99036  
SLUS166B - NOVEMBER 1999 - REVISED NOVEMBER 2004  

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