英飞凌ICE5AR4770BZS CoolSET™芯片中文规格书详解
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更新于2024-06-22
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"ICE5AR4770BZS是英飞凌（INFINEON）推出的一款700V/800V CoolSET™芯片，主要用于电源管理领域，尤其适用于需要高效能和低待机功率的应用。该芯片集成了高度耐用的700V/800V Avalanche CoolMOS™，并提供了多项增强功能，如改进的主动突发模式（Active Burst Mode），以实现低于100mW的超低待机功率。"
ICE5AR4770BZS的关键特性包括：
1. **集成700V/800V Avalanche CoolMOS™**：这是一款高耐压、抗雪崩的功率MOSFET，设计用于承受高压工作环境，确保在大电流开关应用中的可靠性和效率。
2. **增强型主动突发模式**：该模式允许用户选择进入和退出待机状态的条件，以优化功耗，特别适合需要极低待机功耗的系统。
3. **数字频率降低**：此功能使得系统整体效率得以提高，通过调整开关频率来适应负载变化，从而在不同工况下保持最佳能效。
4. **快速启动**：采用 cascode配置，芯片能够在短时间内达到稳定工作状态，缩短了系统的启动时间。
5. **频率抖动和软门驱动**：这些特性降低了电磁干扰（EMI），确保了设备在高频操作下的电磁兼容性。
6. **内置误差放大器**：支持直接反馈的非隔离式电源设计，提供精确的电压控制，提高了电源的稳定性。
7. **全面的保护功能**：包括过流、过热等保护机制，增强了系统在异常条件下的安全性。
8. **数字内置软启动**：确保电源启动过程平滑，防止浪涌电流对系统的影响。
9. **RoHS合规**：采用无铅镀层和卤素自由封装材料，符合环保标准。
该芯片的封装形式为PG-DIP-7，适用于需要高效能、低功耗解决方案的各种电源转换应用，例如开关电源、适配器、电池充电器等。由于其综合的特性和保护机制，ICE5AR4770BZS对于设计师来说是一种理想的选择，可帮助他们构建更高效、更可靠的电源系统。
Datasheet 7 of 36 V 2.3
2020-02-03
Fixed Frequency 700 V/800 V CoolSET™ - in DIP-7 Package
Functional description
3 Functional description
3.1 V
CC
pre-charging and typical V
CC
voltage during start-up
As shown in Figure 1, once the line input voltage is applied, a rectified voltage appears across the capacitor C
BUS.
The pull up resistor R
STARTUP
provides a current to charge the C
iss
(input capacitance) of CoolMOS™ and gradually
generate one voltage level. If the voltage over C
iss
is high enough, CoolMOS™ on and V
CC
capacitor will be
charged through primary inductance of transformer L
P,
CoolMOS™ and internal diode D
1
with two steps
constant current source I
VCC_ Charge1
1
and I
VCC_ Charge3
1
.
A very small constant current source (I
VCC_Charge1
) is charged to the V
CC
capacitor till V
CC
reach V
CC_SCP
to protect the
controller from V
CC
pin short to ground during the start up. After this, the second step constant current source
(I
VCC_Charge3
) is provided to charge the V
CC
capacitor further, until the V
CC
voltage exceeds the turned-on threshold
V
VCC_ON
. As shown in the time phase I in Figure 5, the V
CC
voltage increase almost linearly with two steps.
V
VCC_ON
V
VCC
V
VCC_OFF
t
I
II III
t
A
t
B
V
VCC_SCP
I
VCC_Charge2/3
I
VCC
t1
t
t2
I
VCC_Normal
I
VCC_Charge1
-I
VCC
0
Figure 5 V
CC
voltage and current at startup
The time taking for the V
CC
pre-charging can then be approximately calculated as:
(1)
When the V
CC
voltage exceeds the V
CC
turn on threshold V
VCC_ON
at time t
1
, the IC begins to operate with soft-start.
Due to power consumption of the IC and the fact that there is still no energy from the auxiliary winding to
charge the V
CC
capacitor before the output voltage is built up, the V
CC
voltage drops (Phase II). Once the output
voltage rises close to regulation, the auxiliary winding starts to charge the V
CC
capacitor from the time t
2
onward
and delivering the I
VCC_ Normal
2
to the CoolSET™. The V
CC
then will reach a constant value depending on output
load.
1
I
VCC_ Charge1/2/3
is charging current from the controller to VCC capacitor during start up
2
I
VCC_ Normal
is supply current from VCC capacitor or auxiliary winding to the CoolSET™ during normal operation
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