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NCP1512 Datasheet(PDF) 7 Page - ON Semiconductor |
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NCP1512 Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 12 page NCP1512 http://onsemi.com 7 Figure 3. PWM Circuit Schematic - + - + Vbat C1 10 m Latch OC Detect COMP OVP COMP Error Amp Vref Q2 Q1 L1 6.8 mH R3 R4 En Ramp Set IQ1 R1 R2 Sync Q S R En C2 10 m Vref+5% LOAD 400 m 300 m 200 m 400 m 200 m 0.00 Figure 4. Waveforms During PWM Operation 3.6040 VIN 3.6000 3.5960 400 m 100 m -200 m 3.01 3.00 2.99 3.70 2.00 -0.30 196.0 201.0 204.0 207.0 210.0 213.0 IPFET IL INFET VO VLX TIME ( m) PWM Mode with Internal Oscillator If a synchronization signal is not available, the converter has a 1.0 MHz internal oscillator available. The Sync Pin must be held high to enter this mode. The characteristics of the PWM mode with internal oscillator are similar to the Sync PWM Mode. Pulsed Mode During low-level current output, NCP1512 can enter a low current consumption mode when the Sync Pin is held low. This mode will typically have a free running frequency and an output voltage ripple similar to a PFM mode. The advantage of the Pulsed mode is much lower Iq (14 mA) and drastically higher efficiency compared with PWM and PFM modes in low output loads. |
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Similar Description - NCP1512 |
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