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B340B

更新时间： 2024-11-04 09:06:59
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英特矽尔 - INTERSIL 稳压器
页数 文件大小 规格书
6页 668K
描述
Wide VIN Negative VOUT Buck-Boost Regulator With Up to 5A Output Current

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B340B 数据手册

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Application Note 1636  
Author: Paul Orfanu  
ISL85033-12VEVAL3Z Wide V Negative V  
Buck-Boost Regulator With Up to 5A Output Current  
IN  
OUT  
Evaluating the Other Output Voltages  
The ISL85033-12VEVAL3Z kit output is preset to -12V;  
Hardware Description  
The ISL85033 is a wide input range, dual standard buck  
however, output voltages can be adjusted from -3.3V to -15V.  
converter that can be configured to provide a negative output  
The output voltage programming resistor, R3, depends on the  
voltage. The ISL85033-12VEVAL3Z evaluation board is used in  
desired output voltage of the regulator. The value for the  
this application note to demonstrate the negative  
feedback resistor is typically between 0Ω and 142kΩ as  
configuration. In this configuration, V can range from 4.5V to  
IN  
shown in Equation 1.  
(28V - V  
).  
OUT  
VOUT  
VFB  
⎛
⎝
⎞
– 1  
The ISL85033 is offered in a 4mmx4mm 28 Ld TQFN package  
with 1mm maximum height. The complete converter occupies  
(EQ. 1)  
--------------  
R3 = R2  
⎠
2
6.25cm area.  
Table 1 summarizes the external component selection for  
= -5V, V = -12V, and V = -15V.  
V
OUT  
OUT OUT  
Key Features  
TABLE 1. COMPONENT SELECTION FOR V  
EXTERNAL COMPONENTS  
OUT  
• Wide Input Voltage Range from 4.5V to (28V - V  
)
OUT  
• Adjustable and Synchronizable Negative Output Voltage with  
Continuous Output Current up to 5A, depending on V and  
V
OUT  
-5V  
R3 = 43.2k; R5 = 20k; C4 = 2.7nF  
C20 = 22µF (1210 ceramic)  
C17 = 22µF (1210 ceramic)  
OUT  
V
IN  
• Current Mode Control  
• Adjustable Switching Frequency from 300kHz to 2MHz  
C19 = 68µF (15mΩ polymer EEFUD0K680R)  
-12V R3 = 112k; R5 = 120k; C4 = 4.7nF  
C14, C17 = 22µF (2210 ceramic)  
C12, C19 = 68µF (70mΩ TaNbO2 TPSD686M020R0070)  
C20 = DNP  
• Power-Good Detection (referenced to V  
• Externally Adjustable Soft-start Time  
)
OUT  
• Overcurrent and Hiccup Mode Short Circuit Protection,  
Thermal Overload Protection, UVLO  
-15V R3 = 142k; R5 = 120k; C4 = 4.7nF  
C14, C17 = 22µF (2210 ceramic)  
C12, C19 = 68µF (70mΩ TaNbO2 TPSD686M020R0070)  
C20 = DNP  
• Boot Undervoltage Detection  
• Default Out-of-phase Channels Reduce Voltage Ripple and  
Component Size. User-selectable Phase Operation.  
The curves in Figure 1 indicate the maximum output current  
the converter can deliver as a function of the input voltage and  
the selected output voltage configuration.  
Recommended Equipment  
The following materials are recommended to perform testing:  
Figures 2, 3 and 4 show the efficiency for different V , V  
IN OUT  
and load combinations.  
• 0V to 30V power supply with at least 7A source current  
capability or a 5V battery  
• Electronic loads capable of sinking current up to 7A  
• Digital multimeters (DMMs)  
• 100MHz quad-trace oscilloscope  
• Signal generator  
Quick Setup Guide  
1. Ensure that the circuit is correctly connected to the supply  
and loads prior to applying any power.  
2. Connect the bias supply to VIN1, the plus terminal to VIN1,  
and the negative return to GND1.  
3. Verify that the position is ON for S1.  
4. Turn on the power supply.  
5. Verify the output voltage is -12V for V  
.
OUT  
July 27, 2011  
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.  
Copyright Intersil Americas Inc. 2011. All Rights Reserved.  
1
AN1636.1  
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.  
All other trademarks mentioned are the property of their respective owners.  
123456

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