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ViewSonic Corporation
Confidential - Do Not Copy
VP2650wb-1
26
A-6.) PWM IC (TL1451)
Fig. 2
The Tl1451AC incorporates on a single monolithic chip all the functions required in the
construction of two pulse-width modulation control circuits. Designed primarily for power
supply control, the TL1451AC contains an on-chip 2.5V regulator two error amplifiers, an
adjustable oscillator, two dead-time comparators, under-voltage lockout circuitry, and dual
common-emitter output transistor circuits. The uncommitted output transistors provide
common-emitter output capability for each controller. The internal amplifiers exhibit a
common-mode voltage range from 1.04V to 1.45V. The dead-time control comparator has no
offset unless externally altered and can provide 0% to 100% dead time. The on-chip oscillator
can be operated by modulating RT and CT. During low Vcc conditions, the under-voltage
lockout control circuit feature locks the outputs off until the internal circuitry is operational.
Summary of Contents for VP2650WB - 26" LCD Monitor
Page 42: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 39 Step4 Step 5 Step 6 ...
Page 43: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 40 Step 7 Step 8 Step 9 ...
Page 44: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 41 Step 10 Step 11 ...
Page 51: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 48 4 Packing procedure ...
Page 53: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 50 6 Troubleshooting Flow Chart ...
Page 54: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 51 ...
Page 55: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 52 ...
Page 56: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 53 5 Power no work troubleshooting ...
Page 57: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 54 Power no PFC troubleshooting ...
Page 58: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 55 6 Transmitter Board ...
Page 76: ...9 PCB Layout Diagrams ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 73 ...
Page 77: ...ViewSonic Corporation Confidential Do Not Copy VP2650wb 1 74 ...
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