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| 型号： | MAX17528GTJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/41页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM VID PS 1PH 32-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | Quick-PWM™ |
| 应用： | 控制器，Intel IMVP-6.5? GMCH |
| 输入电压： | 4.5 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.01 V ~ 1.5 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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1-Phase Quick-PWM
Intel IMVP-6.5/GMCH Controllers
INPUT (V IN )
DH
N H
C IN
L
SENSE RESISTOR
L ESL R SENSE
LX
MAX17528
DL
PGND
N L
D L
R1
C EQ
C OUT
C EQ R1 =
L SENSE
R SENSE
CSP
CSN
A) OUTPUT SERIES RESISTOR SENSING
INPUT (V IN )
DH
N H
C IN
L
INDUCTOR
DCR
LX
( R1 + R2 ) R
DL
MAX17528 PGND
N L
D L
R1
R2
C OUT
R CS =
R2
DCR
CSP
C EQ
R DCR =
L
C EQ
[
1
R1
+
1
R2
]
CSN
B) LOSSLESS INDUCTOR SENSING
Figure 4. Current-Sense Methods
Current Limit
The current-limit circuit employs a “valley” current-sens-
ing algorithm that uses a current-sense element (see
Figure 4) between the current-sense inputs (CSP to
CSN) to detect the inductor current. If the differential
current-sense voltage exceeds the current-limit thresh-
old, the PWM controller does not initiate a new cycle
until the inductor current drops below the valley current-
limit threshold. Since only the valley current level is
actively limited, the actual peak inductor current
exceeds the valley current-limit threshold by an amount
equal to the inductor ripple current. Therefore, the exact
current-limit characteristic and maximum load capability
are a function of the current-sense impedance, inductor
value, and battery voltage. When combined with the
undervoltage protection circuit, this current-limit method
is effective in almost every circumstance.
FOR THERMAL COMPENSATION:
R2 SHOULD CONSIST OF AN NTC RESISTOR IN
SERIES WITH A STANDARD THIN-FILM RESISTOR.
The positive valley current-limit threshold voltage at
CSP to CSN equals precisely 1/10 of the differential
TIME to ILIM voltage over a 0.1V to 0.5V range (10mV
to 50mV current-sense range). Connect ILIM directly to
V CC to set the default current-limit threshold setting of
22.5mV nominal.
The negative current-limit threshold (forced-PWM mode
only) is nominally -125% of the corresponding valley
current-limit threshold. When the inductor current drops
below the negative current limit, the controller immedi-
ately activates an on-time pulse—DL turns off, and DH
turns on—allowing the inductor current to remain above
the negative current threshold.
Carefully observe the PCB layout guidelines to ensure
that noise and DC errors do not corrupt the current-sense
signals seen by the current-sense inputs (CSP, CSN).
24
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