ncp5214 ON Semiconductor, ncp5214 Datasheet - Page 22

• Manufacturer Part Number: ncp5214
• Description: 2-in-1 Notebook Ddr Power Controller
• Manufacturer: ON Semiconductor

defined by:
equation:
Modulator DC Gain can be calculated by:
LC filter double pole and ESR zero break frequencies are
Compensation network DC Gain can be calculated by the
Figure 39. Voltage Mode Buck Converter with Modulator, LC filter and Type III Compensation
G MOD(DC) + 20 log
f ZESR +
f PLC +
G COMP(DC) + 20 log
2p
2p
VIN
ESR
ADAPTIVE
L
RAMP
100
−20
−40
−60
Figure 40. Asymptotic Bode Plot of the Converter Gain
OSC
1
80
60
40
20
1
MODULATOR
0
C OUT
V RAMP
C OUT
10
VRAMP
V IN
20 log
20 log
COMP
PWM
R 3
R 1
NCP5214
LOGIC
VDDQ
PWM
100
V RAMP
R 3
R 1
V IN
f
Z1
FREQUENCY (Hz)
1 k
ERROR
f
f
PLC
(eq. 20)
(eq. 21)
(eq. 22)
(eq. 23)
Z2
AMP
http://onsemi.com
VBOOST
VCCP
PGND
A
f
f
ZESR
P1
10 k 100 k 1 M
NCP5214
VREF
22
SWDDQ
PGND
COMP
TGDDQ
BGDDQ
FBDDQ
f
P2
C2
R3
are defined by the below equations:
Modulator & Filter Gain
Type III compensation poles and zeros break frequencies
C1
Q1
Q2
Open Loop Error
Amp Gain
Closed Loop Gain
C3
R4
Compensation
Gain
10 M
L
f Z2 +
R1
R2
f P1 +
VDDQ
f P2 +
f Z1 +
ESR
COUT
VIN
CIN
COMPENSATION
2p
NETWORK
2p
2p
2p
OUTPUT
FILTER
(R 1 ) R 4 )
R 3
R 3
R 4
1
1
1
1
C 1 C 2
C 1 )C 2
C 2
C 3
C 3
(eq. 24)
(eq. 25)
(eq. 26)
(eq. 27)