Daewoo DSL15M1TC, Service Manual

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54
ICS ON HI-VOLTAGE BOARD
1
. BIT3193
High Performance PWM Controller
BIT3193 integrated circuit provides the essential features for general purpose PWM
controller in a small low cost 16-pin package. BIT3193 has built-in a low frequency PWM
generator for any specified application. BIT3193 includes latched off protection feature may
make the system more reliable while compare to other similar products.
·
Features
·
4.5V
～
8V operation
·
Fixed High Frequency, Voltage Mode PWM Control
·
Latched Off Protection
·
Build-In Low Frequency PWM Generator
· Build-in UVLO
· Low Power CMOS Process
·
Totem Pole Output
·
16 Pin Package
·
Applications
· DC/DC Converters
·
LCD TV
·
LCD Monitor
·
Notebook Computer
·
Tablet PC
·
Personal Digital Assistants
·
Navigation Phone/ Door Phone
· Portable consumer product
·
Recommended Operating Condition:
Supply Voltage 4.5
～
8V
Operating Ambient Temperature 0
～70 °C
Operating Frequency 50K ～400K Hz
·
Pin Layout:
1 16
INN MODSEL
CMP ISEN
LOAD CLAMP
CTOSC PWMDC
TIMER CTPWM
ONOFF PWMOUT
GND VDD
NOUT2 NOUT1
8 9
·
Pin Description
Pin
No. Symbol I/O Descriptions
1 INN I/O The inverting input of the error amplifier.
2 CMP O Output of the error amplifier.
3 LOAD I/O A switch that connected to the high frequency triangle wave generator.
This switch is open while ISEN pin <1.3V. An external resistor connected
here may change the operation frequency of CTOSC in open load situation.