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SP6127EK1L Datasheet(PDF) 5 Page - Sipex Corporation |
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SP6127EK1L Datasheet(HTML) 5 Page - Sipex Corporation |
5 / 12 page June 26, 2007 SP6127 TSOT-6 PFET Buck Controller 2007 Sipex Corporation Page 5 Loop Compensation Example 1- A converter utilizing a SP6127 has a 3.3µH inductor and a 22µF/5m ceramic capacitor. Determine whether Type-III compensation is needed. From equation (2) f ESRZERO = 1.45MHz. From equation (3) f DBPOLE = 18.4 kHz. Since the condition specified in (1) is not met, Type-III compensation must be used by adding external components RZ and CZ. Using equation (4) CZ is calculated to be 34pF (use 33pF). Following the guideline given in table 1, a 2k RZ should be used. The steps followed in example 1 were used to compensate the typical application circuit shown on page 1. Satisfactory frequency response of the circuit, seen in figure 2, validates the above procedure. Loop Compensation Example 2- A converter utilizing the SP6127 has a 3.3µH inductor and a 220µF, 82m Aluminum Electrolytic capacitor. Determine whether Type-III compensation is needed. From equation (2) f ESRZERO = 8.8kHz. From equation (3) f DBPOLE = 5.9kHz. Since the condition specified in (1) is not met, Type-III compensation needs to be used by adding external components RZ and CZ. Using equation (4) CZ is calculated 108pF (use 100 pF). Since f ESRZERO / f DBPOLE is approximately 2, RZ must be set at 40k . ______________________________________________________ GENERAL OVERVIEW R1 200k, 1% R2 SP6127 VFB RZ2 200k CZ2 130pF CP1 2pF Error Amplif ier Vref =0.6V Vout RZ CZ Figure 1- RZ and CZ in conjunction with internal compensation components form a Type- III compensation network Figure 2- Satisfactory frequency response of typical application circuit shown on page 1. Crossover frequency fc is 100kHz with a corresponding phase margin of 60 degrees. |
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