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| 型号： | MAX8760ETL+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/39页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR QUICK PWM 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 系列： | Quick-PWM™ |
| 应用： | 控制器，6 位 VID AMD 移动式 Turion? |
| 输入电压： | 4 V ~ 28 V |
| 输出数： | 2 |
| 输出电压： | 0.38 V ~ 1.55 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（6x6） |
| 包装： | 管件 |
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Dual-Phase, Quick-PWM Controller for AMD
Mobile Turion 64 CPU Core Power Supplies
I CCI = G M ( V CMP CMN ) - G M ( V CSP CSN )
On-Time One-Shot (TON)
The core of each phase contains a fast, low-jitter,
adjustable one-shot that sets the high-side MOSFETs
on-time. The one-shot for the main phase varies the on-
time in response to the input and feedback voltages.
The main high-side switch on-time is inversely propor-
tional to the input voltage as measured by the V+ input,
and proportional to the feedback voltage (V FB ):
t ON ( MAIN ) = K ( V FB + 0 . 075 V )
V IN
where K is set by the TON pin-strap connection (Table 6)
and 0.075V is an approximation to accommodate the
expected drop across the low-side MOSFET switch.
The one-shot for the secondary phase varies the on-time
in response to the input voltage and the difference
between the main and secondary inductor currents.
Two identical transconductance amplifiers integrate the
difference between the master and slave current-sense
signals. The summed output is internally connected to
CCI, allowing adjustment of the integration time constant
with a compensation network connected between CCI
and FB.
The resulting compensation current and voltage are
determined by the following equations:
- V - V
V CCI = V FB + I CCI Z CCI
regions such as the 455kHz IF band; second, the induc-
tor ripple-current operating point remains relatively con-
stant, resulting in easy design methodology and
predictable output-voltage ripple. The on-time one-shots
have good accuracy at the operating points specified in
the Electrical Characteristics table. On-times at operating
points far removed from the conditions specified in the
Electrical Characteristics table can vary over a wider
range. For example, the 300kHz setting typically runs
about 3% slower with inputs much greater than 12V due
to the very short on-times required.
On-times translate only roughly to switching frequencies.
The on-times guaranteed in the Electrical Characteristics
table are influenced by switching delays in the external
high-side MOSFET. Resistive losses, including the induc-
tor, both MOSFETs, output capacitor ESR, and PC board
copper losses in the output and ground tend to raise the
switching frequency at higher output currents. Also, the
dead-time effect increases the effective on-time, reduc-
ing the switching frequency. It occurs only during forced-
PWM operation and dynamic output voltage transitions
when the inductor current reverses at light- or negative-
load currents. With reversed inductor current, the induc-
tor’s EMF causes LX to go high earlier than normal,
extending the on-time by a period equal to the DH-rising
dead time.
For loads above the critical conduction point, where the
dead-time effect is no longer a factor, the actual
switching frequency (per phase) is:
where Z CCI is the impedance at the CCI output. The
secondary on-time one-shot uses this integrated signal
(V CCI ) to set the secondary high-side MOSFETs on-time.
f SW =
( V OUT + V DROP 1 )
t ON ( V IN + V DROP 1 - V DROP 2 )
t ON ( 2 ND ) = K ? CCI
V IN
?
?
= K ? FB
? + K ? ?
When the main and secondary current-sense signals
(V CM = V CMP - V CMN and V CS = V CSP - V CSM ) become
unbalanced, the transconductance amplifiers adjust the
secondary on-time, which increases or decreases the
secondary inductor current until the current-sense
signals are properly balanced:
? V + 0 . 075 V ?
?
? V + 0 . 075 V ? ? I CCI Z CCI ?
? V IN ? ? V IN ?
= ( Main on ? time ) + ( Secondary Current
Balance Correction )
where V DROP1 is the sum of the parasitic voltage drops in
the inductor discharge path, including synchronous recti-
fier, inductor, and PC board resistances; V DROP2 is the
sum of the parasitic voltage drops in the inductor charge
path, including high-side switch, inductor, and PC board
resistances; and t ON is the on-time as determined above.
Table 6. Approximate K-Factor Errors
MAX
FREQUENCY
TON K-FACTOR K-FACTOR
SETTING
CONNECTION (μs) ERROR
(kHz)
(%)
This algorithm results in a nearly constant switching
frequency and balanced inductor currents, despite the
lack of a fixed-frequency clock generator. The benefits of
a constant switching frequency are twofold: first, the
frequency can be selected to avoid noise-sensitive
V CC
Float
REF
GND
100
200
300
550
10
5
3.3
1.8
±10
±10
±10
±12.5
26
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8760ETL+ | 功能描述:电流型 PWM 控制器 Dual-Phase Quick PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX8760ETL+T | 功能描述:电流型 PWM 控制器 Dual-Phase Quick PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX8760ETL-T | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX8760EVKIT | 功能描述:电流型 PWM 控制器 Evaluation Kit for the MAX8760 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX8761ETG+ | 功能描述:LCD 驱动器 Linear-Regulator LCD Panel Power Supply RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
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