NCP1034DR2G(2008) 查看數據表（PDF） - ON Semiconductor

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NCP1034DR2G
(Rev.:2008)

100V Synchronous PWM Buck Controller

ON Semiconductor 

NCP1034

VOUT

R1

−

OTA

+

R2

Vref

RC1

CC1

CC2*

*Optional

Figure 27. PI compensation (II Type)

RC1

+

2

@

p @ f0 @ L @

ESR @ VIN

VRAMP @ VOUT

@ Vref @ gm

CC1

+

0.75

@

2

@

1

p@

fP0

@

RC1

CC2

+

p

@

1

RC1

@

fS

R1 + VOUT * Vref @ R2

Vref

(eq. 21)

VRAMP is the peak−to−peak voltage of the oscillator ramp

and gm is the transconductance error amplifier gain.

Capacitor CC2 is optional.

Compensation Type III (PID)

Tantalum and ceramics capacitors have lower ESR than

electrolytic, so the zero of the output LC filter goes to a

higher frequency above the zero crossover frequency. This

situation needs to be compensated by the PID compensation

network that is show in Figure 28.

V OUT

C C2

R FB1

R1

C FB1

R C1 C C1

−

OTA

+

R 2 V REF

Figure 28. PID Compensation (III Type)

There are two methods to select the zeros and poles of

compensation network. The first one (method I) is useable

for tantalum output capacitors, which have a higher ESR

than ceramic, and its zeros and poles can be calculated

shown below:

fZ1 + 0.75 @ fP0

fZ2 + fP0

fP2 + fZ0

fP3

+

fS

2

(eq. 22)

The second one (method II) is for ceramic capacitors:

Ǹ fZ2 + f0 @

1 * sin qmax

1 ) sin qmax

Ǹ fP2 + f0 @

1 ) sin qmax

1 * sin qmax

(eq. 23)

fZ1 + 0.5 @ fZ2

fP3 + 0.5 @ fS

The remaining calculations are the same for both methods.

RC1

uu

2

gm

CC1

+

2

@

p

@

1

fZ1

@

RC1

CC2

+

2

@

p

@

1

fP3

@

RC1

CFB1

+

2

@

p

@

f0

@ L @ VRAMP

VIN @ RC1

@

COUT

RFB1

+

2p

@

1

CFB1

@

fP2

(eq. 24)

R1

+

2

@

p

@

1

CFB1

@

fZ2

*

RFB1

R2 +

Vref

@ R1

VOUT * Vref

To check the design of this compensation network, the

equation must be true

R1

@

R1 @ R2 @ RFB1

RFB1 ) R2 @ RFB1 @

R1

@

R2

u

1

gm

(eq. 25)

If it is not true, then a higher value of RC1 must be selected.

Input Power Supply

The NCP1034 controller and built−in drivers need to be

powered through VCC, DRVVCC and Vb pins with a voltage

between 10 V – 18 V. The supply current requirement is a

summation of the static and dynamic currents. Static current

consumption can be calculated by the following equation:

ICS + ICC ) IC ) IB

(eq. 26)

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