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参数资料
| 型号： | HIP6521EVAL1 |
| 厂商： | Intersil |
| 文件页数： | 4/12页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD HIP6521 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 4，非隔离 |
| 输出电压： | 2.5V，1.5V，1.8V，2.5V |
| 电流 - 输出： | 8A，3A，3A，1A |
| 输入电压： | 3.3V，5V，12V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | HIP6521 |
Application Note 9908
zooms out of the picture presented in Figure 6 in order to
2.5V>
2.5VMEM
detail the restart attempt under a continuous output short-
circuit. Time T0 marks the application of the output short-
circuit. At time T1, after approximately 3 soft-start intervals,
DRIVE4 attempts to restart the output: the output voltage,
2.5V>
1.8V>
1.5V>
2.5VCLK
1.8VMCH
1.5VAGP
and, consequently, the output current ramp up. As the output
current ramps up, the DRIVE4 pin enters current limiting, and
25% into the SS ramp under-voltage monitoring is enabled. At
time T2 the fault condition is detected and the output is shut
down. The cycle repeats for as long as the short-circuit is
present at the output.
+3.3VIN
200 μ s/DIV .
FIGURE 5. OUTPUT TRANSIENT RESPONSE
(CONCURRENT LOADING OF ALL OUTPUTS)
Output Short-Circuit Protection
In response to an over-current event on the switcher’s output, or
an under-voltage event on any of the linear outputs, the faulting
regulator is shut down. Figure 6 exemplifies such a scenario on
1.5VAGP (VOUT4). At time T0, a short-circuit is applied to the
1.5VAGP output; as a result, the output and the ATX 3.3V input
GND >
DRIVE4
1.5VAGP
IOUT 1.5VAGPNOTE
start to sag under the increasing output current. DRIVE4
responds by increasing the base drive for the pass element
(Q5). At time T1, DRIVE4 reaches its output current limit. The
NOTE - 5A/DIV.
T0
5ms/DIV .
T1
T2
ATX 3.3V output reflects the current limit event through the
settling of the voltage seen between times T1 and T2. As the
current drawn in current limiting from the ATX supply does not
equal the output current drawn by the short-circuit, the
1.5VAGP output continues to drop. At time T2, the 70%
undervoltage threshold is reached and the output is shut down.
FIGURE 7. HIP6521EVAL1 VOUT4 HICCUP MODE UNDER
APPLIED SHORT CIRCUIT
Switching Regulator Ef?ciency
Figure 8 highlights the evaluation board’s conversion
ef?ciency with only the switching section loaded. The
measurement was performed at room temperature with the
linear outputs open and 100 LFM of air ?ow.
+3.3VIN
90
89
DRIVE4
88
87
86
85
GND >
1.5VAGP
IOUT 1.5VAGPNOTE
84
83
82
81
NOTE - 5A/DIV.
20 μ s/DIV.
80
0
1
2
3
4
5
6
7
8
9
10
11
T0
T1
T2
OUTPUT CURRENT (A)
FIGURE 6. HIP6521EVAL1 VOUT4 UNDER-VOLTAGE
RESPONSE (SHORT-CIRCUIT PROTECTION)
FIGURE 8. HIP6521EVAL1 SWITCHING REGULATOR
MEASURED EFFICIENCY (ALL LINEAR
OUTPUTS UNLOADED)
Following an over-current shutdown, a restart attempt is
performed after approximately 3 soft-start periods. Figure 7
4
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