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| 型号： | ZL2105EVK2 |
| 厂商： | Intersil |
| 文件页数： | 11/36页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD 2 ZL2105 |
| 标准包装： | 1 |
| 系列： | * |
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ZL2105
4.2 Power Conversion Overview
>
INPUT VOLTAGE BUS
>
PG
EN
MGN ILIM DLY
SS
CFG V(0,1)
BST
VTRK
POWER MANAGEMENT
NVM
I SENSE
LDO
FC
DIGITAL
COMPENSATOR
D-PWM
MOSFET
SW
V OUT
SYNC
GEN
NLR
DRIVERS
SYNC
PLL
ADC
-
VDR
+
RESET
REF
ADC
VDD
I SENSE
VR
CHG
PUMP
CP1
CP2
VSEN
SALRT
SDA
SCL
SA
COMMUNICATION
ADC
MUX
TEMP
SENSOR
XTEMP
Figure 5. ZL2105 Block Diagram
The ZL2105 operates as a voltage-mode, synchronous
buck converter with a selectable constant frequency
is known as the duty cycle D , which is described by the
following equation:
PWM control scheme. The ZL2105 incorporates dual
low R DS(ON) synchronous MOSFETs to help minimize
the required circuit footprint.
D
V OUT
V IN
V IN
C IN
During time D, QH is on and V IN – V OUT is applied
across the inductor.
As shown in Figure 5, the output voltage is directly
LDO
D B
QH
C B
L 1
applied to the VSEN pin. The VSEN signal is then
compared to an internal programmable reference
voltage that is set to the desired output voltage level.
PWM
QL
V OUT
C OUT
The error signal derived from this comparison is
converted to a digital value with a fast analog to digital
(A/D) converter. The digital signal is also applied to an
ZL2105
adjustable digital compensation
filter, and the
compensated signal is used to derive the appropriate
Figure 6. Synchronous Buck Converter
converter topology showing the primary power train
components. This converter is also called a step-down
converter, as the output voltage must always be lower
than the input voltage. The ZL2105 integrates two
MOSFETs; QH is the top control MOSFET and QL is
the bottom synchronous MOSFET. The amount of time
that QH is on as a fraction of the total switching period
11
PWM duty cycle for driving the internal MOSFETs.
The ZL2105 also incorporates a non-linear response
(NLR) loop to improve the response time and reduce
the output deviation as a result of a load transient. The
ZL21 05 monitors the power converter’s operating
conditions and continuously adjusts the turn-on and
turn-off timing of the high-side and low-side
MOSFETs to optimize the overall efficiency of the
power supply.
FN6851.2
March 30, 2011
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