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参数资料
| 型号： | ISL6754AAZA-T |
| 厂商： | Intersil |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM/VM 20-QSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流/电压模式 |
| 输出数： | 6 |
| 频率 - 最大： | 2MHz |
| 占空比： | 100% |
| 电源电压： | 9 V ~ 16 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 105°C |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
ISL6754
If Δ V CS is greater than or equal to V e , then no additional
Example:
V IN ? DT SW
N S ?
DT SW ?
R CS = --------------------------------------------------------------------------------------------------------------------------------------
-------- ? ? I O + ----------------- ? ? V IN ? ------- S - – V O ? ? + -------------------------------
slope compensation is needed and R CS becomes:
N CT
N ? ?
N P ? 2L O ? N P ? ? L m
(EQ. 21)
V IN = 280V
V O = 12V
L O = 2.0μH
Np/Ns = 20
If Δ V CS is less than Ve, then Equation 16 is still valid for the
value of R CS , but the amount of slope compensation added
by the external ramp must be reduced by Δ V CS .
Adding slope compensation may be accomplished in the
ISL6754 using the CTBUF signal. CTBUF is an amplified
representation of the sawtooth signal that appears on the CT
pin. It is offset from ground by 0.4V and is 2x the peak-to-
peak amplitude of CT (0.4V to 4.4V). A typical application
sums this signal with the current sense feedback and applies
the result to the CS pin as shown in Figure 10.
Lm = 2mH
I O = 55A
Oscillator Frequency, Fsw = 400kHz
Duty Cycle, D = 85.7%
N CT = 50
R6 = 499 Ω
Solve for the current sense resistor, R CS , using Equation 18.
R CS = 15.1 Ω .
1
2
3 CTBUF
4
5
20
19
18
17
16
Determine the amount of voltage, V e , that must be added to
the current feedback signal using Equation 15.
Ve = 153mV
Next, determine the effect of the magnetizing current from
Equation 20.
R9
6
ISL6754
15
Δ V CS = 91mV
7
8 RAMP
14
13
Using Equation 23, solve for the summing resistor, R9, from
CTBUF to CS.
R CS
R6
C4
9 CS
10
12
GND 11
R9 = 30.1k Ω
Determine the new value of R CS , R’ CS , using Equation 24.
R’ CS = 15.4 Ω
The above discussion determines the minimum external
ramp that is required. Additional slope compensation may be
FIGURE 10. ADDING SLOPE COMPENSATION
Assuming the designer has selected values for the RC filter
placed on the CS pin, the value of R9 required to add the
appropriate external ramp can be found by superposition.
considered for design margin.
If the application requires deadtime less than about 500ns,
the CTBUF signal may not perform adequately for slope
compensation. CTBUF lags the CT sawtooth waveform by
V e – Δ V CS = -------------------------------------------------------------------------------
( D ( V CTBUF – 0.4 ) – V e + Δ V CS + 0.4 ) ? R6
V e – Δ V CS
( D ( V CTBUF – 0.4 ) + 0.4 ) ? R6
R6 + R9
Rearranging to solve for R9 yields:
R9 = -------------------------------------------------------------------------------------------------------------------
V
Ω
(EQ. 22)
(EQ. 23)
300ns to 400ns. This behavior results in a non-zero value of
CTBUF when the next half-cycle begins when the deadtime
is short.
Under these situations, slope compensation may be added
by externally buffering the CT signal as shown in Figure 11.
The value of R CS determined in Equation 18 or 21 must be
rescaled so that the current sense signal presented at the
CS pin is that predicted by Equation 16. The divider created
by R6 and R9 makes this necessary.
R ′ CS = ---------------------- ? R CS
R6 + R9
R9
14
(EQ. 24)
FN6754.1
September 29, 2008
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