HA16150T Datasheet, PDF (16/25 Pages) Renesas Technology Corp – High-Speed Current Mode Push-Pull PWM Control IC

HA16150T/P
6. Current Limiter Level
The drooping characteristic of the power supply output can be adjusted by adjusting the CSLIM pin voltage.
For example, the drooping characteristic can easily be adjusted, as shown in the figure below, by setting VREF to a
divided value with resistances R1 and R2 and connecting adjustment resistance Rx in parallel to R2.
VREF ₁₆
R1
15k
Vref
−
Rx
R2
12k
+
E-amp.
Vcc
5 CS
CS
Comp.
2R
R
3
EOUT
4
CSLIM
Figure 7 CSLIM Peripheral Circuit
The graph below shows examples of power supply output drooping characteristic adjustment in a push-pull converter.
As shown in this graph, the point at which the power supply output current limit begins to be applied can be adjusted by
adjustment of the CSLIM pin voltage.
3.60
3.40
Rx: 24k
Rx: 33k
(VCSLIM = 1.75V) (VCSLIM = 1.85V)
Rx: open
(VCSLIM = 2.22V)
3.20
3.00
2.80
2.60
Rx: 15k
(VCSLIM = 1.55V)
Rx: 47k
(VCSLIM = 1.95V)
2.40
2.20
2.00
0.0
2.0
4.0
6.0
8.0
10.0
Iout (A)
Figure 8 Adjustment of Power Supply Output Drooping Characteristic
Rev.3.00 Jan 30, 2007 page 16 of 24