Daewoo DSL19M1WC, Service Manual

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52
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Low Power CMOS Process
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Totem Pole Output
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16 Pin Package
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Applications
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DC/DC Converters
·
LCD TV
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LCD Monitor
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Notebook Computer
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Tablet PC
· Personal Digital Assistants
· Navigation Phone/ Door Phone
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Portable consumer product
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Recommended Operating Condition:
Supply Voltage 4.5 ～ 8V
Operating Ambient Temperature 0 ～70 °C
Operating Frequency 50K ～400K Hz
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Pin Layout:
1 16
INN MODSEL
CMP ISEN
LOAD CLAMP
CTOSC PWMDC
TIMER CTPWM
ONOFF PWMOUT
GND VDD
NOUT2 NOUT1
8 9
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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.
4 CTOSC I/O An external capacitor connected here can set the frequency of high
frequency PWM controller.
5 TIMER I/O With internal reference current and an external capacitor connected here
can set the required period of starting and the timing of initialization. The
controller is forced to reset mode while TIMER<0.3V. During reset mode,
a
～
60uA current will flow into the INN pin to reduce the output level of the
error amplifier CMP to turn off the controller. The latched off protection
function will be enable after this node is charged to>2.5V. System is latched
off if any abnormal operation is detected if pin TIMER>2.5V.
The output current of this pin is 20uA when TIMER<0.3V.
The output current becomes to 1uA when TIMER>0.3V.
6 ONOFF I The control pin of turning on or off the IC.1V threshold with an internal 80K