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参数资料
| 型号： | ISL8112EVAL1Z |
| 厂商： | Intersil |
| 文件页数： | 17/27页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD FOR ISL8112 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 2，非隔离 |
| 输出电压： | 0.7 ~ 5.5 V |
| 电流 - 输出： | 200mA |
| 输入电压： | 5.5 ~ 25 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 可调式 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL8112 |
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ISL8112
FS
VIN
Min. t OFF
Q TRIG
ONE SHOT
VSEN_
+
R Q Q
TO UG_DRIVER
S Q Q
ILIM_
5μA
OUT2REF (SMPS2)
VREF
SLOPE COMP
COMP
BOOT
UV
DETECT
BOOT_
VCC
PH_
VSEN_
S
?
MODE
S Q Q
R Q Q
TO LG_ DRIVER
FB
DECODER
0.9V REF
PGOOD_
LATCH
FB_
1.1V REF
OV_LATCH_
UV_LATCH_
FAULT
FAULT
LATCH
LOGIC
0.7V REF
20ms
BLANKING
FIGURE 21. PWM CONTROLLER (ONE SIDE ONLY)
Automatic Pulse-Skipping Switch Over
(Idle Mode)
In Idle Mode (MODE = GND), an inherent automatic switch
over to PFM takes place at light loads. This switch over is
Δ I
t
=
VIN-VOUT
L
I PEAK
affected by a comparator that truncates the low-side switch
on-time at the inductor current's zero crossing. This
mechanism causes the threshold between pulse-skipping
PFM and non-skipping PWM operation to coincide with the
boundary between continuous and discontinuous
inductor-current operation (also known as the critical
conduction point):
I LOAD = I PEAK /2
V IN
2 ? L
K ? V OUT V IN – V OUT
I LOAD ( SKIP ) = ------------------------ --------------------------------
(EQ. 3)
0
ON-TIME
TIME
where K is the on-time scale factor (see “On-Time One-Shot
(FS)” on page 12). The load-current level at which
PFM/PWM crossover occurs, I LOAD(SKIP) , is equal to half
the peak-to-peak ripple current, which is a function of the
inductor value (Figure 22). For example, in the ISL8112
typical application circuit with VOUT1 = 5V, V IN = 12V,
L = 7.6μH, and K = 5μs, switch over to pulse-skipping
operation occurs at I LOAD = 0.96A or about on-fifth full load.
The crossover point occurs at an even lower value if a
swinging (soft-saturation) inductor is used.
17
FIGURE 22. ULTRASONIC CURRENT WAVEFORMS
The switching waveforms may appear noisy and
asynchronous when light loading causes pulse-skipping
operation, but this is a normal operating condition that
results in high light-load efficiency. Trade-offs in PFM noise
vs. light-load efficiency are made by varying the inductor
value. Generally, low inductor values produce a broader
efficiency vs. load curve, while higher values result in higher
full-load efficiency (assuming that the coil resistance remains
fixed) and less output voltage ripple. Penalties for using
FN6396.1
August 10, 2010
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相关代理商/技术参数 |
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| ISL8112IRZ | 功能描述:IC REG DL BCK/LINEAR SYNC 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| ISL8112IRZ-T | 功能描述:IC REG DL BCK/LINEAR SYNC 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 + 切换式 系列:- 标准包装:2,500 系列:- 拓扑:降压（降压）同步（3），线性（LDO）（2） 功能:任何功能 输出数:5 频率 - 开关:300kHz 电压/电流 - 输出 1:控制器 电压/电流 - 输出 2:控制器 电压/电流 - 输出 3:控制器 带 LED 驱动器:无 带监控器:无 带序列发生器:是 电源电压:5.6 V ~ 24 V 工作温度:-40°C ~ 85°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| ISL8115 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High Voltage Synchronous Buck PWM Controller with Integrated Gate Driver and Current Sharing Capability |
| ISL8115EVAL1Z | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High Voltage Synchronous Buck PWM Controller with Integrated Gate Driver and Current Sharing Capability |
| ISL8115EVAL2Z | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High Voltage Synchronous Buck PWM Controller with Integrated Gate Driver and Current Sharing Capability |
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