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ZHCSCW6B August 2014 – January 2018 LM43601

PRODUCTION DATA.

封装选项

机械数据 (封装 | 引脚)

PWP|16
- MPDS371A

散热焊盘机械数据 (封装 | 引脚)

PWP|16
- PPTD297B

订购信息

8.2 Typical Application

The LM43601 only requires a few external components to convert from a wide range of supply voltage to output voltage. Figure 44 shows a basic schematic when BIAS is connected to V_OUT . This is recommended for V_OUT ≥ 3.3 V. For V_OUT < 3.3 V, connect BIAS to ground, as shown in Figure 45.

Figure 44. LM43601 Basic Schematic for
V_OUT ≥ 3.3 V, Tie BIAS to V_OUT

Figure 45. LM43601 Basic Schematic for
V_OUT < 3.3 V, Tie BIAS to Ground

The LM43601 also integrates a full list of optional features to aid system design requirements, such as precision enable, V_CC UVLO, programmable soft start, output voltage tracking, programmable switching frequency, clock synchronization and power-good indication. Each application can select the features for a more comprehensive design. A schematic with all features utilized is shown in Figure 46.

Figure 46. LM43601 Schematic With All Features

The external components have to fulfill the needs of the application, but also the stability criteria of the device control loop. The LM43601 is optimized to work within a range of external components. The inductance and capacitance of the LC output filter have to be considered in conjunction, creating a double pole, responsible for the corner frequency of the converter. Table 2 can be used to simplify the output filter component selection.

Table 2. L, C_OUT and C_FF Typical Values

F_S (kHz)	L (µH)	C_OUT (µF) ⁽¹⁾	C_FF (pF) ⁽²⁾⁽³⁾	R_T (kΩ)	R_FBB (kΩ) ⁽²⁾⁽³⁾
V_OUT = 1 V
200	18	500	none	200	100
500	6.8	330	none	80.6 or open	100
1000	3.3	180	none	39.2	100
2200	1.5	100	none	17.8	100
V_OUT = 3.3 V
200	47	220	44	200	442
500	18	100	33	80.6 or open	442
1000	10	47	18	39.2	442
2200	4.7	27	12	17.8	442
V_OUT = 5 V
200	56	150	68	200	255
500	27	66	33	80.6 or open	255
1000	15	33	22	39.2	255
2200	6.8	22	18	17.8	255
V_OUT = 12 V
200	100	33	see note ⁽⁴⁾	200	90.9
500	47	22	47	80.6 or open	90.9
1000	22	15	33	39.2	90.9

(1) All the C_OUT values are after derating. Add more when using ceramics.

(2) R_FBT = 0 Ω for V_OUT = 1 V. R_FBT = 1 MΩ for all other V_OUT settings.

(3) For designs with R_FBT other than 1 MΩ, adjust C_FF so that (C_FF × R_FBT) is unchanged, and adjust R_FBB so that (R_FBT / R_FBB) is unchanged.

(4) High ESR C_OUT gives enough phase boost, and C_FF not needed.